Error:

SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '146' for key 'PRIMARY' (SQL: insert into `staff` (`user_id`, `agent_id`, `created_at`) values (363, 2121, 1457079046))

The primary key in the table structure isId, since the increase, 146 this record does exist, insert, I did not provideIdIn theory, the value of should be increased by itself. Since the value is increased by itself, there should be no duplicate primary key in theory.

Table structure:

May I ask what kind of situation will cause this kind of problem?

Thanks!