FIX

app/views/projects/branches.json.jbuilder

@@ -9,9 +9,14 @@ json.array! @branches do |branch|
     json.timestamp render_unix_time(branch['commit']['timestamp'])
     json.time_from_now time_from_now(branch['commit']['timestamp'])
   end
+
+  user = User.find_by_login branch['commit']['author']['name']
   json.author do
-    user = User.find_by_login branch['commit']['author']['name']
+    if user
-    json.login user.login
+      json.login user.login
-    json.image_url url_to_avatar(user)
+      json.image_url url_to_avatar(user)
+    else
+      json.nil
+    end
   end
 end