Gorm Sometimes Error is "<nil>" instead of nil

Your Question

if res = db.Save(&msg); res.Error != nil {
    log.Error(err)
    return
}

I have simple code which is update row in database, but time-to-time it gives me \u003cnil\u003e (<nil>)instead of nil. Any reason or any experience who have ?

Database: CockroachDB Connection: postgres connstring

The document you expected this should be explained

Expected answer

Return always nil instead of "<nil>"

Comment From: sabuhigr

Its because schema doesn't allow it.

SQL Error [23505]: ERROR: duplicate key value violates unique constraint "table_column_idx" Detail: Key (column_name)=('XXXXXX') already exists.

It gives me "<nil>", not actual error. Want to report it.

Comment From: sabuhigr

I got this answer from Dbeaver, but in gorm there is no such chance for catch it.