diff --git a/package.json b/package.json
index cd7c2e4..803266e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "CustomString",
-  "version": "2.2.5",
+  "version": "2.2.6",
   "description": "Create a string with a microflow",
   "license": "",
   "author": "",
diff --git a/src/CustomString/widget/CustomString.js b/src/CustomString/widget/CustomString.js
index 45eea66..cb061d6 100644
--- a/src/CustomString/widget/CustomString.js
+++ b/src/CustomString/widget/CustomString.js
@@ -86,7 +86,9 @@ define([
 
         _processSourceMFCallback: function (callback, returnedString) {
             logger.debug(this.id + "._processSourceMFCallback");
-            html.set(this.customString, this.checkString(returnedString, this.renderHTML));
+            if (this.customString) {
+                html.set(this.customString, this.checkString(returnedString, this.renderHTML));
+            }
             this._executeCallback(callback, "_processSourceMFCallback");
         },
 
diff --git a/src/package.xml b/src/package.xml
index 41b81bb..14a37ad 100644
--- a/src/package.xml
+++ b/src/package.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <package xmlns="http://www.mendix.com/package/1.0/">
-    <clientModule name="CustomString" version="2.2.5" xmlns="http://www.mendix.com/clientModule/1.0/">
+    <clientModule name="CustomString" version="2.2.6" xmlns="http://www.mendix.com/clientModule/1.0/">
         <widgetFiles>
             <widgetFile path="CustomString/CustomString.xml"/>
             <widgetFile path="CustomString/CustomStringNoContext.xml"/>
diff --git a/test/widgets/CustomString.mpk b/test/widgets/CustomString.mpk
index 7aa8606..b4b9562 100644
Binary files a/test/widgets/CustomString.mpk and b/test/widgets/CustomString.mpk differ