diff --git a/app/workers/project_cache_worker.rb b/app/workers/project_cache_worker.rb
index 61416d634bd..55cb6af232e 100644
--- a/app/workers/project_cache_worker.rb
+++ b/app/workers/project_cache_worker.rb
@@ -7,6 +7,9 @@ class ProjectCacheWorker
     project = Project.find(project_id)
     project.update_repository_size
     project.update_commit_count
-    project.repository.build_cache
+
+    if project.repository.root_ref
+      project.repository.build_cache
+    end
   end
 end