Mysql SQLSTATE[23000]：完整性约束冲突错误

我不知道我的请求有什么问题这是我的错误

"SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: 
    a foreign key constraint fails 
        (
            `charitydb`.`helps_periodic`, 
            CONSTRAINT `helps_periodic_ibfk_3` 
            FOREIGN KEY (`to_help_seeker_id`) 
            REFERENCES `users` (`user_id`)) 
            (SQL: insert into `helps_periodic` 
                (`from_id`, 
                    `to_help_seeker_id`, 
                    `helper_type`, 
                    `monthly_amount`, 
                    `from_date`, 
                    `to_date`) 
                values 
                (11, 48252217461, user, 200, 1400-3-25, 1400-3-28))"