error

ActiveRecord::RecordNotSaved in Admin::UsersController#update

Failed to remove the existing associated subscription. The record failed to save when after its foreign key was set to nil.

params

{"utf8"=>"✓",
 "_method"=>"put",
 "authenticity_token"=>"...",
 "user"=>{"email"=>"blah@gmail.com",
 "password"=>"[FILTERED]",
 "first_name"=>"Tom",
 "last_name"=>"Jones",
 "subscription_attributes"=>{"plan_id"=>"5"}},
 "password_confirmation"=>"[FILTERED]",
 "commit"=>"Update User",
 "id"=>"2"}