Cakephp 2.3.5 - Edit data gets "Integrity constraint violation: 1062 Duplicate entry"

I have an model with hbtm and was working fine, but about an day, when i try do edit an Record, the query try to SET the primary key and "Erro: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '4472' for key 'PRIMARY'".

Any ideas ?

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