diff --git a/app/helpers/repositories_helper.rb b/app/helpers/repositories_helper.rb
index a21cbaf0..f1e59432 100644
--- a/app/helpers/repositories_helper.rb
+++ b/app/helpers/repositories_helper.rb
@@ -115,7 +115,7 @@ module RepositoriesHelper
    def new_readme_render_decode64_content(str, owner, repo, ref, readme_path, readme_name)
     file_path = readme_path.include?('/') ? readme_path.gsub("/#{readme_name}", '') : readme_path.gsub("#{readme_name}", '')
     return nil if str.blank?
-    content = Base64.decode64(content).force_encoding('UTF-8').valid_encoding? ? Base64.decode64(str).force_encoding('UTF-8') : Base64.decode64(str).force_encoding("GBK").encode("UTF-8")
+    content = Base64.decode64(str).force_encoding('UTF-8').valid_encoding? ? Base64.decode64(str).force_encoding('UTF-8') : Base64.decode64(str).force_encoding("GBK").encode("UTF-8")
     # s_regex = /\s\!\[.*?\]\((.*?)\)\s/
     s_regex_c = /`{1,2}[^`](.*?)`{1,2}/
     s_regex = /```([\s\S]*?)```[\s]?/