Fatal error: Uncaught PDOException: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'alfa' in 'where clause' in /home/golas/public_html/_class.php:37 Stack trace: #0 /home/golas/public_html/_class.php(37): PDOStatement->execute() #1 /home/golas/public_html/_class.php(32): Database->execute() #2 /home/golas/public_html/_class.php(151): Database->single() #3 /home/golas/public_html/proizvod.php(20): Crud->getSingleWhereBy('`products`', 'product_id = al...') #4 {main} thrown in /home/golas/public_html/_class.php on line 37