diff --git a/app/views/repositories/_contributor.json.jbuilder b/app/views/repositories/_contributor.json.jbuilder
index ea8a5ae30..5d1c093bd 100644
--- a/app/views/repositories/_contributor.json.jbuilder
+++ b/app/views/repositories/_contributor.json.jbuilder
@@ -3,7 +3,7 @@ if user.blank?
   json.contributions contributor["commits"]
   json.login nil
   json.type nil
-  json.name contributor["name"].downcase
+  json.name contributor["name"].to_s.downcase
   json.email contributor["email"]
   json.image_url User::Avatar.get_letter_avatar_url(contributor["name"])
   json.contribution_perc User.new(login: contributor["name"], mail: contributor["email"]).simple_contribution_perc(project, contributor["contribution_perc"])
@@ -13,7 +13,7 @@ else
   json.login user["login"]
   json.email user["email"]
   json.type user["type"]
-  json.name user["name"].downcase
+  json.name user["name"].to_s.downcase
   json.image_url user["avatar_url"]
   db_user = User.find_by_id(user["id"])
   json.contribution_perc db_user.simple_contribution_perc(project, contributor["contribution_perc"]) if db_user.present?