--- redmine/app/models/issue.rb.bak	2011-05-20 13:43:42.622806962 +0200
+++ redmine/app/models/issue.rb	2011-05-20 13:44:34.682807002 +0200
@@ -518,6 +518,8 @@
           errors.add_to_base l(:notice_locking_conflict)
           raise ActiveRecord::Rollback
         end
+      else
+        raise ActiveRecord::Rollback
       end
     end
   end