Fatal error: Uncaught mysqli_sql_exception: Cannot delete or update a parent row: a foreign key constraint fails (`u382015753_veduit`.`courses`, CONSTRAINT `courses_ibfk_2` FOREIGN KEY (`teacher_id`) REFERENCES `teachers` (`id`)) in /home/u382015753/domains/cardicky.com/public_html/veduit/teachers.php:51 Stack trace: #0 /home/u382015753/domains/cardicky.com/public_html/veduit/teachers.php(51): mysqli_stmt->execute() #1 {main} thrown in /home/u382015753/domains/cardicky.com/public_html/veduit/teachers.php on line 51