diff --git a/app/models/tiny_mce_asset.rb b/app/models/tiny_mce_asset.rb
index c5667e145..141f526d9 100644
--- a/app/models/tiny_mce_asset.rb
+++ b/app/models/tiny_mce_asset.rb
@@ -106,6 +106,8 @@ class TinyMceAsset < ApplicationRecord
   end
 
   def self.update_old_tinymce(description)
+    return description unless description
+
     description.scan(/\[~tiny_mce_id:(\w+)\]/).flatten.each do |token|
       old_format = /\[~tiny_mce_id:#{token}\]/
       new_format = "<img src=\"\" class=\"img-responsive\" data-mce-token=\"#{Base62.encode(token.to_i)}\"/>"