diff --git a/app/models/repository/git.rb b/app/models/repository/git.rb
index 037be94e5..e07e7c804 100644
--- a/app/models/repository/git.rb
+++ b/app/models/repository/git.rb
@@ -257,6 +257,7 @@ class Repository::Git < Repository
   end
 
   def clear_extra_info_of_changesets
+    return if extra_info.nil?
     v = extra_info["extra_report_last_commit"]
     write_attribute(:extra_info, nil)
     h = {}