Model Issue with validation clause

NoMethodError in Percentage_statistics#update

Showing app/views/percentage_statistics/edit.html.erb where line #7 raised:
You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating

error in percentage_statistics_controller.rb:80:in `update'

This is definitely one of the tougher errors, when something is invalid in a model you can hunt forever in the controller and not find it!

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