diff --git a/app/controllers/concerns/git_helper.rb b/app/controllers/concerns/git_helper.rb
index f22753dde..ec0f2ad82 100644
--- a/app/controllers/concerns/git_helper.rb
+++ b/app/controllers/concerns/git_helper.rb
@@ -25,6 +25,8 @@ module GitHelper
         decode_content =
             if cd["encoding"] == 'GB18030' && cd['confidence'] > 0.8
               content.encode('UTF-8', 'GBK', {:invalid => :replace, :undef => :replace, :replace => ' '})
+            elsif cd['encoding'].blank?
+              raise("无效的utf-8文件")
             else
               Rails.logger.info("####encoding:#{content.encoding}")
               content.force_encoding('UTF-8')