diff --git a/app/services/merge_requests/base_service.rb b/app/services/merge_requests/base_service.rb
index b250c2d7d21664f0982b6d631ed6ab4ba9b9d19d..7f7bfa29af7ef751447811bfa6515aa30928dac7 100644
--- a/app/services/merge_requests/base_service.rb
+++ b/app/services/merge_requests/base_service.rb
@@ -39,6 +39,8 @@ def target_project
 
     # Don't try to print expensive instance variables.
     def inspect
+      return "#<#{self.class}>" unless respond_to?(:merge_request)
+
       "#<#{self.class} #{merge_request.to_reference(full: true)}>"
     end