Fatal error: Uncaught PDOException: SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (`voiceapp`.`notifications`, CONSTRAINT `fk_notifications_user` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE) in C:\xampp\htdocs\voice-backend\cron\weekly_summary_cron.php:19 Stack trace: #0 C:\xampp\htdocs\voice-backend\cron\weekly_summary_cron.php(19): PDOStatement->execute(Array) #1 {main} thrown in C:\xampp\htdocs\voice-backend\cron\weekly_summary_cron.php on line 19