ActiveModel::UnknownAttributeError: unknown attribute 'duplicated_to_id' for Issue.

https://sentry.gitlab.net/gitlab/gitlabcom/issues/957632/

ActiveModel::UnknownAttributeError: unknown attribute 'duplicated_to_id' for Issue.
  active_model/attribute_assignment.rb:53:in `_assign_attribute'
    raise UnknownAttributeError.new(self, k)
  active_model/attribute_assignment.rb:44:in `block in _assign_attributes'
    _assign_attribute(k, v)
  active_model/attribute_assignment.rb:43:in `each'
    attributes.each do |k, v|
  active_model/attribute_assignment.rb:43:in `_assign_attributes'
    attributes.each do |k, v|
  active_record/attribute_assignment.rb:23:in `_assign_attributes'
    super(attributes)
...
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ActiveModel::UnknownAttributeError: unknown attribute 'duplicated_to_id' for Issue.