Error when adding a new field to an existing mysql table?

SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '1001450908680' for key 'PRIMARY' (SQL: alter table `bq_posts` add `type2` varchar(255) null after `updated_at`)

Tell me what's wrong here? Trying to an existing table to add a field type2 does not.
June 14th 19 at 20:24

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