diff --git a/app/views/repositories/_contributor.json.jbuilder b/app/views/repositories/_contributor.json.jbuilder
index d2caa53c..bd1a037f 100644
--- a/app/views/repositories/_contributor.json.jbuilder
+++ b/app/views/repositories/_contributor.json.jbuilder
@@ -14,5 +14,5 @@ else
   json.name user["name"]
   json.image_url user["avatar_url"]
   db_user = User.find_by_id(user["id"])
-  json.contribution_perc db_user.contribution_perc(project)
+  json.contribution_perc db_user.contribution_perc(project) if db_user.present?
 end