Fatal error: Uncaught TypeError: Return value of KatalogStanicek::hlavickaKatalogu() must be of the type string, null returned in /var/www/gtktupesycz/web/class/stanicky-katalog.class.php:468 Stack trace: #0 /var/www/gtktupesycz/web/class/presenter-stanicky.class.php(609): KatalogStanicek->hlavickaKatalogu('u20') #1 /var/www/gtktupesycz/web/class/presenter-stanicky.class.php(286): StanickyPresenter->getTableStan() #2 /var/www/gtktupesycz/web/class/presenter-stanicky.class.php(59): StanickyPresenter->getTeloStanicek() #3 /var/www/gtktupesycz/web/class/presenter-gtk.class.php(114): StanickyPresenter->stanickyPresenter() #4 /var/www/gtktupesycz/web/index.php(249): presenterGTK->presenterGTK() #5 {main} thrown in /var/www/gtktupesycz/web/class/stanicky-katalog.class.php on line 468