Fatal error: Uncaught PDOException: SQLSTATE[23000]: Integrity constraint violation: 1451 Cannot delete or update a parent row: a foreign key constraint fails (`shortener`.`link_clicks`, CONSTRAINT `link_clicks_ibfk_1` FOREIGN KEY (`link_code`) REFERENCES `links` (`code`)) in /var/www/html/index.php:8 Stack trace: #0 /var/www/html/index.php(8): PDOStatement->execute() #1 {main} thrown in /var/www/html/index.php on line 8