diff --git a/src/Cli/AddUserCommand.php b/src/Cli/AddUserCommand.php
index 212649e..7ea8256 100644
--- a/src/Cli/AddUserCommand.php
+++ b/src/Cli/AddUserCommand.php
@@ -10,7 +10,7 @@ use Symfony\Component\Console\Output\OutputInterface;
 
 class AddUserCommand extends Command
 {
-    public function configure()
+    public function configure(): void
     {
         $this->setName('user:add')
             ->setDescription('Adding of user.')
diff --git a/src/Cli/LinkViewCommand.php b/src/Cli/LinkViewCommand.php
index cccd74e..0ac4a31 100644
--- a/src/Cli/LinkViewCommand.php
+++ b/src/Cli/LinkViewCommand.php
@@ -11,7 +11,7 @@ use Symfony\Component\Console\Output\OutputInterface;
 
 class LinkViewCommand extends Command
 {
-    public function configure()
+    public function configure(): void
     {
         $this->setName('view:link')
             ->setDescription('Linking of views.')
diff --git a/src/Cli/MaintainDatabaseCommand.php b/src/Cli/MaintainDatabaseCommand.php
index f2afc70..ccb5b59 100644
--- a/src/Cli/MaintainDatabaseCommand.php
+++ b/src/Cli/MaintainDatabaseCommand.php
@@ -14,7 +14,7 @@ use Symfony\Component\Console\Output\OutputInterface;
 
 class MaintainDatabaseCommand extends Command
 {
-    private PersistentDataManager $persistentDataManager;
+    private PersistentDataManager $pdm;
 
     private UserRepository $userRepository;
 
@@ -26,13 +26,13 @@ class MaintainDatabaseCommand extends Command
     {
         parent::__construct();
 
-        $this->persistentDataManager = new PersistentDataManager();
+        $this->pdm = new PersistentDataManager();
         $this->userRepository = new UserRepository();
         $this->userConfirmationRepository = new UserConfirmationRepository();
         $this->userPasswordResetterRepository = new UserPasswordResetterRepository();
     }
 
-    public function configure()
+    public function configure(): void
     {
         $this->setName('db:maintain')
             ->setDescription('Maintain database.');
@@ -76,7 +76,7 @@ class MaintainDatabaseCommand extends Command
                 $this->pdm->deleteFromDb($userPasswordResetter);
             }
 
-            $this->persistentDataManager->deleteFromDb($user);
+            $this->pdm->deleteFromDb($user);
         }
 
         \Container::$dbConnection->commit();
@@ -85,7 +85,7 @@ class MaintainDatabaseCommand extends Command
     private function deleteExpiredPasswordResetters(): void
     {
         foreach ($this->userPasswordResetterRepository->getAllExpired() as $passwordResetter) {
-            $this->persistentDataManager->deleteFromDb($passwordResetter);
+            $this->pdm->deleteFromDb($passwordResetter);
         }
     }
 
diff --git a/src/Cli/MigrateDatabaseCommand.php b/src/Cli/MigrateDatabaseCommand.php
index ac81743..da0943f 100644
--- a/src/Cli/MigrateDatabaseCommand.php
+++ b/src/Cli/MigrateDatabaseCommand.php
@@ -9,7 +9,7 @@ use Symfony\Component\Console\Output\OutputInterface;
 
 class MigrateDatabaseCommand extends Command
 {
-    public function configure()
+    public function configure(): void
     {
         $this->setName('db:migrate')
             ->setDescription('Migration of database changes.');
@@ -88,6 +88,10 @@ class MigrateDatabaseCommand extends Command
         $path = ROOT . '/database/migrations/' . $type;
         $dir = opendir($path);
 
+        if ($dir === false) {
+            throw new \Exception('Cannot open dir: ' . $path);
+        }
+
         $files = [];
         while ($file = readdir($dir)) {
             $filePath = $path . '/' . $file;
diff --git a/src/Controller/GameController.php b/src/Controller/GameController.php
index 7bcc2dd..6d65b2a 100644
--- a/src/Controller/GameController.php
+++ b/src/Controller/GameController.php
@@ -32,7 +32,7 @@ class GameController
         return new JsonContent($this->prepareGame($mapId));
     }
 
-    private function prepareGame(int $mapId)
+    private function prepareGame(int $mapId): array
     {
         $map = $this->mapRepository->getById($mapId);
 
diff --git a/src/Controller/GameFlowController.php b/src/Controller/GameFlowController.php
index c7cf95b..b414eb0 100644
--- a/src/Controller/GameFlowController.php
+++ b/src/Controller/GameFlowController.php
@@ -128,7 +128,7 @@ class GameFlowController
         ]);
     }
 
-    private function addNewRoundToState(&$state, Place $place, array $placesWithoutPano): void
+    private function addNewRoundToState(array &$state, Place $place, array $placesWithoutPano): void
     {
         $state['rounds'][] = [
             'placesWithoutPano' => $placesWithoutPano,
diff --git a/src/Controller/MapAdminController.php b/src/Controller/MapAdminController.php
index 6a46f28..add5232 100644
--- a/src/Controller/MapAdminController.php
+++ b/src/Controller/MapAdminController.php
@@ -161,7 +161,7 @@ class MapAdminController implements ISecured
         return new JsonContent(['mapId' => $map->getId(), 'added' => $addedIds]);
     }
 
-    public function deleteMap()
+    public function deleteMap(): IContent
     {
         $mapId = (int) $this->request->query('mapId');
 
diff --git a/src/Controller/UserController.php b/src/Controller/UserController.php
index 4b0e26f..805b752 100644
--- a/src/Controller/UserController.php
+++ b/src/Controller/UserController.php
@@ -210,7 +210,7 @@ class UserController implements ISecured
         return new JsonContent(['success' => true]);
     }
 
-    private function confirmUserIdentity(User $user, ?DateTime $authenticatedWithGoogleUntil, ?string $password, &$error): bool
+    private function confirmUserIdentity(User $user, ?DateTime $authenticatedWithGoogleUntil, ?string $password, string &$error): bool
     {
         if ($authenticatedWithGoogleUntil !== null && $authenticatedWithGoogleUntil > new DateTime()) {
             return true;
diff --git a/src/Database/Mysql/Connection.php b/src/Database/Mysql/Connection.php
index 42dcef6..da5022b 100644
--- a/src/Database/Mysql/Connection.php
+++ b/src/Database/Mysql/Connection.php
@@ -12,11 +12,11 @@ class Connection implements IConnection
     public function __construct(string $host, string $user, string $password, string $db, int $port = -1, string $socket = null)
     {
         if ($port < 0) {
-            $port = ini_get('mysqli.default_port');
+            $port = (int) ini_get('mysqli.default_port');
         }
 
         if ($socket === null) {
-            $socket = ini_get('mysqli.default_socket');
+            $socket = (string) ini_get('mysqli.default_socket');
         }
 
         $this->connection = new mysqli($host, $user, $password, $db, $port, $socket);
diff --git a/src/Database/Query/Select.php b/src/Database/Query/Select.php
index a2ffda6..08a1049 100644
--- a/src/Database/Query/Select.php
+++ b/src/Database/Query/Select.php
@@ -30,7 +30,7 @@ class Select
 
     private array $orders = [];
 
-    private array $limit;
+    private ?array $limit;
 
     public function __construct(IConnection $connection, ?string $table = null)
     {
@@ -144,7 +144,7 @@ class Select
         $this->limit = null;
     }
 
-    public function paginate(int $page, int $itemsPerPage)
+    public function paginate(int $page, int $itemsPerPage): Select
     {
         $this->limit($itemsPerPage, ($page - 1) * $itemsPerPage);
 
@@ -308,7 +308,7 @@ class Select
         return implode(' ', $joins);
     }
 
-    private function generateConditions(string $type): array
+    private function generateConditions(int $type): array
     {
         $conditions = '';
         $params = [];
@@ -376,9 +376,9 @@ class Select
         return [$conditionsString, $params];
     }
 
-    private function generateComplexConditionFragment(string $type, Closure $conditionCallback): array
+    private function generateComplexConditionFragment(int $type, Closure $conditionCallback): array
     {
-        $instance = new static($this->connection, $this->table);
+        $instance = new self($this->connection, $this->table);
         $instance->tableAliases = $this->tableAliases;
 
         $conditionCallback($instance);
diff --git a/src/Database/Utils.php b/src/Database/Utils.php
index 3c4042e..be025c4 100644
--- a/src/Database/Utils.php
+++ b/src/Database/Utils.php
@@ -1,7 +1,8 @@
 <?php namespace MapGuesser\Database;
 
 class Utils {
-    public static function backtick(string $name) {
+    public static function backtick(string $name): string
+    {
         return '`' . $name . '`';
     }
 }
diff --git a/src/Http/Request.php b/src/Http/Request.php
index 9f1a05b..7655905 100644
--- a/src/Http/Request.php
+++ b/src/Http/Request.php
@@ -29,7 +29,7 @@ class Request implements IRequest
         $this->method = $method;
     }
 
-    public function setQuery($query)
+    public function setQuery($query): void
     {
         if (is_string($query)) {
             $this->query = $query;
@@ -38,7 +38,7 @@ class Request implements IRequest
         }
     }
 
-    public function setHeaders(array $headers)
+    public function setHeaders(array $headers): void
     {
         $this->headers = array_merge($this->headers, $headers);
     }
@@ -47,13 +47,13 @@ class Request implements IRequest
     {
         $ch = curl_init();
 
-        if ($this->method === self::HTTP_GET) {
-            $url = $this->url . '?' . $this->query;
-        } elseif ($this->method === self::HTTP_POST) {
-            $url  = $this->url;
+        if ($this->method === self::HTTP_POST) {
+            $url = $this->url;
 
             curl_setopt($ch, CURLOPT_POST, 1);
             curl_setopt($ch, CURLOPT_POSTFIELDS, $this->query);
+        } else {
+            $url = $this->url . '?' . $this->query;
         }
 
         curl_setopt($ch, CURLOPT_URL, $url);
diff --git a/src/Http/Response.php b/src/Http/Response.php
index 65958b0..a7354f3 100644
--- a/src/Http/Response.php
+++ b/src/Http/Response.php
@@ -14,12 +14,12 @@ class Response implements IResponse
         $this->headers = $headers;
     }
 
-    public function getBody()
+    public function getBody(): string
     {
         return $this->body;
     }
 
-    public function getHeaders()
+    public function getHeaders(): array
     {
         return $this->headers;
     }
diff --git a/src/Interfaces/Http/IRequest.php b/src/Interfaces/Http/IRequest.php
index 10436f7..0b791ea 100644
--- a/src/Interfaces/Http/IRequest.php
+++ b/src/Interfaces/Http/IRequest.php
@@ -10,9 +10,9 @@ interface IRequest
 
     public function setMethod(int $method): void;
 
-    public function setQuery($query);
+    public function setQuery($query): void;
 
-    public function setHeaders(array $headers);
+    public function setHeaders(array $headers): void;
 
     public function send(): IResponse;
 }
diff --git a/src/Interfaces/Http/IResponse.php b/src/Interfaces/Http/IResponse.php
index b840bac..1320fd2 100644
--- a/src/Interfaces/Http/IResponse.php
+++ b/src/Interfaces/Http/IResponse.php
@@ -2,7 +2,7 @@
 
 interface IResponse
 {
-    public function getBody();
+    public function getBody(): string;
 
-    public function getHeaders();
+    public function getHeaders(): array;
 }
diff --git a/src/Interfaces/Request/IRequest.php b/src/Interfaces/Request/IRequest.php
index e4499e5..699daea 100644
--- a/src/Interfaces/Request/IRequest.php
+++ b/src/Interfaces/Request/IRequest.php
@@ -4,7 +4,7 @@ use MapGuesser\Interfaces\Authentication\IUser;
 
 interface IRequest
 {
-    public function setParsedRouteParams(array &$routeParams);
+    public function setParsedRouteParams(array &$routeParams): void;
 
     public function getBase(): string;
 
diff --git a/src/Mailing/Mail.php b/src/Mailing/Mail.php
index 58befb0..4f3600d 100644
--- a/src/Mailing/Mail.php
+++ b/src/Mailing/Mail.php
@@ -77,7 +77,7 @@ class Mail
         }
     }
 
-    private function sendMail(PHPMailer $mailer, array $recipient)
+    private function sendMail(PHPMailer $mailer, array $recipient): void
     {
         $mailer->clearAddresses();
         $mailer->addAddress($recipient[0], $recipient[1]);
diff --git a/src/OAuth/GoogleOAuth.php b/src/OAuth/GoogleOAuth.php
index 1c9fbf0..cfd34f1 100644
--- a/src/OAuth/GoogleOAuth.php
+++ b/src/OAuth/GoogleOAuth.php
@@ -4,9 +4,9 @@ use MapGuesser\Interfaces\Http\IRequest;
 
 class GoogleOAuth
 {
-    private static $dialogUrlBase = 'https://accounts.google.com/o/oauth2/v2/auth';
+    private static string $dialogUrlBase = 'https://accounts.google.com/o/oauth2/v2/auth';
 
-    private static $tokenUrlBase = 'https://oauth2.googleapis.com/token';
+    private static string $tokenUrlBase = 'https://oauth2.googleapis.com/token';
 
     private IRequest $request;
 
@@ -36,7 +36,7 @@ class GoogleOAuth
         return self::$dialogUrlBase . '?' . http_build_query($oauthParams);
     }
 
-    public function getToken(string $code, string $redirectUrl)
+    public function getToken(string $code, string $redirectUrl): array
     {
         $tokenParams = [
             'code' => $code,
diff --git a/src/PersistentData/Model/User.php b/src/PersistentData/Model/User.php
index a4ebf60..8081cac 100644
--- a/src/PersistentData/Model/User.php
+++ b/src/PersistentData/Model/User.php
@@ -45,9 +45,9 @@ class User extends Model implements IUser
         }
     }
 
-    public function setActive($active): void
+    public function setActive(bool $active): void
     {
-        $this->active = (bool) $active;
+        $this->active = $active;
     }
 
     public function setGoogleSub(?string $googleSub): void
@@ -105,10 +105,10 @@ class User extends Model implements IUser
         switch ($permission) {
             case IUser::PERMISSION_NORMAL:
                 return true;
-                break;
             case IUser::PERMISSION_ADMIN:
                 return $this->type === 'admin';
-                break;
+            default:
+                throw new \Exception('Permission does not exist: ' . $permission);
         }
     }
 
@@ -124,6 +124,10 @@ class User extends Model implements IUser
 
     public function checkPassword(string $password): bool
     {
+        if ($this->password === null) {
+            return false;
+        }
+
         return password_verify($password, $this->password);
     }
 }
diff --git a/src/PersistentData/PersistentDataManager.php b/src/PersistentData/PersistentDataManager.php
index 38c58db..126f695 100644
--- a/src/PersistentData/PersistentDataManager.php
+++ b/src/PersistentData/PersistentDataManager.php
@@ -8,7 +8,7 @@ use MapGuesser\PersistentData\Model\Model;
 
 class PersistentDataManager
 {
-    public function selectFromDb(Select $select, string $type, bool $withRelations = false): ?Model
+    public function selectFromDb(Select $select, string $type, bool $withRelations = false)
     {
         $select = $this->createSelect($select, $type, $withRelations);
 
@@ -37,7 +37,7 @@ class PersistentDataManager
         }
     }
 
-    public function selectFromDbById($id, string $type, bool $withRelations = false): ?Model
+    public function selectFromDbById($id, string $type, bool $withRelations = false)
     {
         $select = new Select(\Container::$dbConnection);
         $select->whereId($id);
diff --git a/src/Repository/PlaceRepository.php b/src/Repository/PlaceRepository.php
index cccca7a..0a2a197 100644
--- a/src/Repository/PlaceRepository.php
+++ b/src/Repository/PlaceRepository.php
@@ -46,14 +46,20 @@ class PlaceRepository
         return $place;
     }
 
-    private function selectRandomFromDbForMap(int $mapId, array $exclude): ?Place
+    private function selectRandomFromDbForMap(int $mapId, array $exclude): Place
     {
         //TODO: omit table name here
         $select = new Select(\Container::$dbConnection, 'places');
         $select->where('id', 'NOT IN', $exclude);
         $select->where('map_id', '=', $mapId);
 
-        $numberOfPlaces = $select->count(); // TODO: what if 0
+        $numberOfPlaces = $select->count();
+
+        //TODO: prevent this
+        if ($numberOfPlaces === 0) {
+            throw new \Exception('There is no selectable place (count was 0).');
+        }
+
         $randomOffset = random_int(0, $numberOfPlaces - 1);
 
         $select->orderBy('id');
diff --git a/src/Request/Request.php b/src/Request/Request.php
index 0b41fa7..cdbc02f 100644
--- a/src/Request/Request.php
+++ b/src/Request/Request.php
@@ -39,7 +39,7 @@ class Request implements IRequest
         }
     }
 
-    public function setParsedRouteParams(array &$routeParams)
+    public function setParsedRouteParams(array &$routeParams): void
     {
         $this->routeParams = &$routeParams;
     }
diff --git a/src/Request/Session.php b/src/Request/Session.php
index f1fedab..36d4f0f 100644
--- a/src/Request/Session.php
+++ b/src/Request/Session.php
@@ -11,12 +11,12 @@ class Session implements ISession
         $this->data = &$data;
     }
 
-    public function has($key): bool
+    public function has(string $key): bool
     {
         return isset($this->data[$key]);
     }
 
-    public function get($key)
+    public function get(string $key)
     {
         if (isset($this->data[$key])) {
             return $this->data[$key];
@@ -25,12 +25,12 @@ class Session implements ISession
         return null;
     }
 
-    public function set($key, $value): void
+    public function set(string $key, $value): void
     {
         $this->data[$key] = $value;
     }
 
-    public function delete($key): void
+    public function delete(string $key): void
     {
         unset($this->data[$key]);
     }
diff --git a/src/Response/HtmlContent.php b/src/Response/HtmlContent.php
index 377b32e..3dcc29a 100644
--- a/src/Response/HtmlContent.php
+++ b/src/Response/HtmlContent.php
@@ -23,6 +23,7 @@ class HtmlContent extends ContentBase
 
         require ROOT . '/cache/views/' . $this->view . '.php';
 
+        // @phpstan-ignore-next-line - SCRIPT_STARTED is defined in main.php
         echo '<!-- __debug__runtime: ' . round((hrtime(true) - SCRIPT_STARTED) / 1e+6, 1) . ' -->';
     }
 
diff --git a/src/Response/JsonContent.php b/src/Response/JsonContent.php
index 9632328..70f4769 100644
--- a/src/Response/JsonContent.php
+++ b/src/Response/JsonContent.php
@@ -9,6 +9,7 @@ class JsonContent extends ContentBase
 
     public function render(): void
     {
+        // @phpstan-ignore-next-line - SCRIPT_STARTED is defined in main.php
         $this->data['__debug__runtime'] = round((hrtime(true) - SCRIPT_STARTED) / 1e+6, 1);
 
         echo json_encode($this->data);
diff --git a/src/Response/Redirect.php b/src/Response/Redirect.php
index ed78183..4560155 100644
--- a/src/Response/Redirect.php
+++ b/src/Response/Redirect.php
@@ -16,7 +16,7 @@ class Redirect implements IRedirect
 
     public function getUrl(): string
     {
-        if (preg_match('/^http(s)?/', $this->target)) {
+        if (preg_match('/^http(s)?/', $this->target) === 1) {
             $link = $this->target;
         } else {
             $link = \Container::$request->getBase() . '/' . $this->target;
diff --git a/src/Routing/Route.php b/src/Routing/Route.php
index afe5491..5079fad 100644
--- a/src/Routing/Route.php
+++ b/src/Routing/Route.php
@@ -30,7 +30,7 @@ class Route
         $link = [];
 
         foreach ($this->pattern as $fragment) {
-            if (preg_match('/^{(\\w+)(\\?)?}$/', $fragment, $matches)) {
+            if (preg_match('/^{(\\w+)(\\?)?}$/', $fragment, $matches) === 1) {
                 if (isset($parameters[$matches[1]])) {
                     $link[] = $parameters[$matches[1]];
                     unset($parameters[$matches[1]]);
@@ -61,7 +61,7 @@ class Route
         $parameters = [];
 
         foreach ($path as $i => $fragment) {
-            if (preg_match('/^{(\\w+)(?:\\?)?}$/', $this->pattern[$i], $matches)) {
+            if (preg_match('/^{(\\w+)(?:\\?)?}$/', $this->pattern[$i], $matches) === 1) {
                 $parameters[$matches[1]] = $fragment;
             } elseif ($fragment != $this->pattern[$i]) {
                 return null;
diff --git a/src/Routing/RouteCollection.php b/src/Routing/RouteCollection.php
index 1430002..0e65bb3 100644
--- a/src/Routing/RouteCollection.php
+++ b/src/Routing/RouteCollection.php
@@ -76,7 +76,7 @@ class RouteCollection
 
         $this->searchTable[$method][$groupNumber][] = $route;
 
-        while (preg_match('/^{\\w+\\?}$/', end($pattern))) {
+        while (preg_match('/^{\\w+\\?}$/', end($pattern)) === 1) {
             $groupNumber--;
             array_pop($pattern);
 
diff --git a/src/Session/DatabaseSessionHandler.php b/src/Session/DatabaseSessionHandler.php
index 3949625..64e7d37 100644
--- a/src/Session/DatabaseSessionHandler.php
+++ b/src/Session/DatabaseSessionHandler.php
@@ -69,7 +69,7 @@ class DatabaseSessionHandler implements ISessionHandler
         return true;
     }
 
-    public function gc($maxlifetime): int
+    public function gc($maxlifetime): bool
     {
         // empty on purpose
         // old sessions are deleted by MaintainDatabaseCommand
@@ -84,7 +84,7 @@ class DatabaseSessionHandler implements ISessionHandler
 
     public function validateId($id): bool
     {
-        return preg_match('/^[a-f0-9]{32}$/', $id);
+        return preg_match('/^[a-f0-9]{32}$/', $id) === 1;
     }
 
     public function updateTimestamp($id, $data): bool
diff --git a/src/Util/Geo/Bounds.php b/src/Util/Geo/Bounds.php
index 99f1edb..2efef91 100644
--- a/src/Util/Geo/Bounds.php
+++ b/src/Util/Geo/Bounds.php
@@ -27,7 +27,7 @@ class Bounds
 
     public static function createDirectly(float $southLat, float $westLng, float $northLat, float $eastLng): Bounds
     {
-        $instance = new static();
+        $instance = new self();
 
         $instance->southLat = $southLat;
         $instance->westLng = $westLng;
diff --git a/src/Util/JwtParser.php b/src/Util/JwtParser.php
index b6e57a1..f9bc38e 100644
--- a/src/Util/JwtParser.php
+++ b/src/Util/JwtParser.php
@@ -11,7 +11,7 @@ class JwtParser
         }
     }
 
-    public function setToken(string $token)
+    public function setToken(string $token): void
     {
         $this->token = explode('.', str_replace(['_', '-'], ['/', '+'], $token));
     }
diff --git a/src/View/Linker.php b/src/View/Linker.php
index b9e237b..ca67886 100644
--- a/src/View/Linker.php
+++ b/src/View/Linker.php
@@ -65,7 +65,7 @@ class Linker
         while (($line = fgets($inputFileHandle)) !== false) {
             ++$lineNumber;
 
-            if (preg_match('/^\s*@yields\(\'([\w\/]+)\'\)\s*$/', $line, $matches)) {
+            if (preg_match('/^\s*@yields\(\'([\w\/]+)\'\)\s*$/', $line, $matches) === 1) {
                 if (isset($sections[$matches[1]])) {
                     fwrite($outputFileHandle, $sections[$matches[1]]);
                 }
@@ -105,7 +105,7 @@ class Linker
         fclose($outputFileHandle);
     }
 
-    private function generateAssets(ParsedFragment $fragment, array &$sections)
+    private function generateAssets(ParsedFragment $fragment, array &$sections): void
     {
         foreach ($fragment->getCss() as $cssFile) {
             $asset = $this->parseAsset($cssFile);
@@ -134,7 +134,7 @@ class Linker
     {
         $output = [];
 
-        if (preg_match('/^[\w\/\.]+$/', $asset)) {
+        if (preg_match('/^[\w\/\.]+$/', $asset) === 1) {
             if (
                 empty($_ENV['DEV']) &&
                 filesize(ROOT . '/public/static/' . $asset) < self::INLINE_ASSET_LIMIT
diff --git a/src/View/Parser.php b/src/View/Parser.php
index 7802a7a..29be6a6 100644
--- a/src/View/Parser.php
+++ b/src/View/Parser.php
@@ -108,7 +108,7 @@ class Parser
 
     private function matchCss(string $line): ?string
     {
-        if (preg_match('/^\s*@css\((.*)\)\s*$/', $line, $matches)) {
+        if (preg_match('/^\s*@css\((.*)\)\s*$/', $line, $matches) === 1) {
             return $matches[1];
         }
 
@@ -117,7 +117,7 @@ class Parser
 
     private function matchJs(string $line): ?string
     {
-        if (preg_match('/^\s*@js\((.*)\)\s*$/', $line, $matches)) {
+        if (preg_match('/^\s*@js\((.*)\)\s*$/', $line, $matches) === 1) {
             return $matches[1];
         }
 
@@ -126,7 +126,7 @@ class Parser
 
     private function matchExtends(string $line): ?string
     {
-        if (preg_match('/^\s*@extends\(([\w\/]+)\)\s*$/', $line, $matches)) {
+        if (preg_match('/^\s*@extends\(([\w\/]+)\)\s*$/', $line, $matches) === 1) {
             return $matches[1];
         }
 
@@ -135,7 +135,7 @@ class Parser
 
     private function matchSection(string $line): ?string
     {
-        if (preg_match('/^\s*@section\((\w+)\)\s*$/', $line, $matches)) {
+        if (preg_match('/^\s*@section\((\w+)\)\s*$/', $line, $matches) === 1) {
             return $matches[1];
         }
 
@@ -144,16 +144,16 @@ class Parser
 
     private function matchEndSection(string $line): bool
     {
-        return preg_match('/^\s*@endsection(?:\(\))?\s*$/', $line);
+        return preg_match('/^\s*@endsection(?:\(\))?\s*$/', $line) === 1;
     }
 
     private function matchExtra(string $line): bool
     {
-        return preg_match('/^\s*@extra(?:\(\))?\s*$/', $line);
+        return preg_match('/^\s*@extra(?:\(\))?\s*$/', $line) === 1;
     }
 
     private function matchEndExtra(string $line): bool
     {
-        return preg_match('/^\s*@endextra(?:\(\))?\s*$/', $line);
+        return preg_match('/^\s*@endextra(?:\(\))?\s*$/', $line) === 1;
     }
 }
diff --git a/tests/PersistentData/Model/ModelTest.php b/tests/PersistentData/Model/ModelTest.php
index 6e0b042..8cad912 100644
--- a/tests/PersistentData/Model/ModelTest.php
+++ b/tests/PersistentData/Model/ModelTest.php
@@ -3,6 +3,10 @@
 use MapGuesser\PersistentData\Model\Model;
 use PHPUnit\Framework\TestCase;
 
+class OtherModel
+{
+}
+
 class DummyModel extends Model
 {
     protected static string $table = 'test_table';