Fatal error: Uncaught exception 'Exception' with message 'Column 'instruction_id' cannot be null' in /htdocs/classes/Db/Db_connection.class.php:62 Stack trace: #0 /htdocs/classes/Db/Db_connection.class.php(68): Db_connection->execute('INSERT `views` ...') #1 /htdocs/classes/Mysql/Mysql_insert.class.php(76): Db_connection->execute_query('INSERT `views` ...') #2 /htdocs/views/step.php(67): Mysql_insert->execute() #3 {main} thrown in /htdocs/classes/Db/Db_connection.class.php on line 62