diff --git a/modules/beefjs/encode/json.js b/modules/beefjs/encode/json.js
index 42f7a0fdc..9231ba877 100644
--- a/modules/beefjs/encode/json.js
+++ b/modules/beefjs/encode/json.js
@@ -12,7 +12,7 @@ beef.encode.json = {
             return "null";
     
         if (type == "undefined")
-            return undefined;
+            return '\"\"';
         
         if (type == "number" || type == "boolean")
             return o + "";