diff --git a/app/models/notice.rb b/app/models/notice.rb
index f3764ce..1abf5a4 100644
--- a/app/models/notice.rb
+++ b/app/models/notice.rb
@@ -91,7 +91,7 @@ class Notice
   end
 
   def decrease_counter_cache
-    problem.inc(:notices_count, -1)
+    problem.inc(:notices_count, -1) if err
   end
 
   def unresolve_problem
--
libgit2 0.21.2