lib/registry.rb in regstry-1.0.8 vs lib/registry.rb in regstry-1.0.9

@@ -83,10 +83,10 @@
       obj.instance_variable_set(:@registry_key, key)
       registry[key] = obj
     end
 
     def unregister(obj = self)
-      return unless obj.registry_key
+      return unless obj.respond_to?(:registry_key) && obj.registry_key
       registry.delete(obj.registry_key)
       obj.remove_instance_variable(:@registry_key)
     end
 
     def registered?(key)