rails 4.0.0 destroy nested attributes throws error -

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i have 2 models question , answer. question has many answers. creating , updating of nested attributes working. when nested attribute set remove setting '_destroy' '1' or 'true'. app throws error.

in controller params permitted 

params.require(:question).permit(:name, :answers_attributes => [:id, :name,  :_destroy ])

error 

undefined method 'name' on nil class


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