Genial B1 - Intensivtrainer

Fatal error: Uncaught TypeError: mysqli_num_rows(): Argument #1 ($result) must be of type mysqli_result, bool given in /var/www/clients/client1/web3/web/eshop/funcfront.php:5089 Stack trace: #0 /var/www/clients/client1/web3/web/eshop/funcfront.php(5089): mysqli_num_rows() #1 /var/www/clients/client1/web3/web/eshop/funcfront.php(1129): review_score() #2 /var/www/clients/client1/web3/web/eshop/detail.php(22): knihadetail() #3 {main} thrown in /var/www/clients/client1/web3/web/eshop/funcfront.php on line 5089