Fatal error: Uncaught TypeError: mysqli_fetch_object(): Argument #1 ($result) must be of type mysqli_result, bool given in /customers/f/b/2/albatros-duiken.be/httpd.www/albatros/classes/mapper/ActivityMapper.class.php:10
Stack trace:
#0 /customers/f/b/2/albatros-duiken.be/httpd.www/albatros/classes/mapper/ActivityMapper.class.php(10): mysqli_fetch_object(false)
#1 /customers/f/b/2/albatros-duiken.be/httpd.www/albatros/classes/repository/ActivityRepository.class.php(116): ActivityMapper->mapItem(false)
#2 /customers/f/b/2/albatros-duiken.be/httpd.www/albatros/classes/handler/RegistrationActionHandler.class.php(65): ActivityRepository->findById(NULL)
#3 /customers/f/b/2/albatros-duiken.be/httpd.www/albatros/classes/handler/RegistrationActionHandler.class.php(39): RegistrationActionHandler->navigateToActivity()
#4 /customers/f/b/2/albatros-duiken.be/httpd.www/albatros/classes/handler/ActionController.class.php(30): RegistrationActionHandler->execute()
#5 /customers/f/b/2/albatros-duiken.be/httpd.www/albatros/template.php(11): ActionController->execute('saveRegistratio...')
#6 {main}
  thrown in /customers/f/b/2/albatros-duiken.be/httpd.www/albatros/classes/mapper/ActivityMapper.class.php on line 10