diff --git a/app/models/plan.rb b/app/models/plan.rb
index 6718a3b..98e809f 100644
--- a/app/models/plan.rb
+++ b/app/models/plan.rb
@@ -167,7 +167,7 @@
         end
       end
     end
-    return ggroups.uniq!
+    return ggroups.uniq
   end