diff --git a/app/helpers/repositories_helper.rb b/app/helpers/repositories_helper.rb
index 440f833aa..b0eea0e59 100644
--- a/app/helpers/repositories_helper.rb
+++ b/app/helpers/repositories_helper.rb
@@ -5,8 +5,8 @@ module RepositoriesHelper
   end
 
   def download_type(str)
-    default_type = %w(xlsx xls ppt pptx pdf zip 7z rar exe pdb obj idb)
-    default_type.include?(str)
+    default_type = %w(xlsx xls ppt pptx pdf zip 7z rar exe pdb obj idb png jpg gif tif psd svg)
+    default_type.include?(str&.downcase)
   end
 
   def render_commit_author(author_json)
diff --git a/app/views/projects/branches.json.jbuilder b/app/views/projects/branches.json.jbuilder
index 3e0981d68..15a51428e 100644
--- a/app/views/projects/branches.json.jbuilder
+++ b/app/views/projects/branches.json.jbuilder
@@ -13,13 +13,13 @@ json.array! @branches do |branch|
     json.time_from_now time_from_now(branch['commit']['timestamp'])
   end
 
-  user = User.find_by_login branch['commit']['author']['name']
+  user = User.find_by_login branch['commit']['author']['username']
   json.author do
     if user
       json.login user.login
       json.image_url url_to_avatar(user)
     else
-      json.nil
+      json.nil!
     end
   end
 end