Fatal error: Uncaught TypeError: preg_quote(): Argument #1 ($str) must be of type string, int given in /home/philippi/DEV/app/src/Services/FlashcardNavigationService.php:246 Stack trace: #0 /home/philippi/DEV/app/src/Services/FlashcardNavigationService.php(246): preg_quote(104, '/') #1 /home/philippi/DEV/app/src/Controllers/FlashcardController.php(60): App\Services\FlashcardNavigationService->topicRefForSourceQuery('National Intern...') #2 /home/philippi/DEV/app/src/Core/Router.php(413): App\Controllers\FlashcardController->index(Object(App\Core\Request)) #3 /home/philippi/DEV/app/src/Core/Router.php(98): App\Core\Router->executeHandler('App\\Controllers...', Object(App\Core\Request), Object(App\Core\Container)) #4 /home/philippi/DEV/public/index.php(43): App\Core\Router->dispatch(Object(App\Core\Request), Object(App\Core\Container)) #5 {main} thrown in /home/philippi/DEV/app/src/Services/FlashcardNavigationService.php on line 246