Provider page show ERROR "Multiple parents found.[ems_cloud/show_list]

My mageiq show the error log in the picture

I marked the code in “models/mixins/relationship_mixin.rb” the app works fine.

157   def parent(*args)
158     rels = parent_rels(*args).take(2)
159     #raise _("Multiple parents found.") if rels.length > 1
160     rels.first.try(:resource)
161   end

My environment is fine-2 version.
What operation may make the error?