save! not allowed after validates_uniqueness

I have this in a model

     validates_uniqueness_of :aspect, :scope => :user_id

In an instance method of the same model I have "save!" but I don't touch
the :aspect attribute in that instance method at all.

Whenever that save! command is run however I get this error:

      ActiveRecord::RecordInvalid: Validation failed:  Aspect has
already been taken

I don't understand.  The validation should not skip the instance from
which the method is called.  Please help.  Thanks.
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