diff --git a/src/ts/plugins/embedworker.ts b/src/ts/plugins/embedworker.ts
index f7c172b4..6929b000 100644
--- a/src/ts/plugins/embedworker.ts
+++ b/src/ts/plugins/embedworker.ts
@@ -79,7 +79,7 @@ const whitelist = [
 
 const evaluation = globaly.eval
 
-const prop = Object.getOwnPropertyNames( globaly )
+const prop = Object.getOwnPropertyNames( globaly ).concat( Object.getOwnPropertyNames( this ))
 prop.push(
     //unsafe apis
     'open',
@@ -114,6 +114,16 @@ prop.forEach( function( prop ) {
             });     
         } catch (error) {
         }  
+        try {
+            Object.defineProperty( this, prop, {
+                get : function() {
+                    throw "Security Exception: cannot access "+prop;
+                    return 1;
+                }, 
+                configurable : false
+            });     
+        } catch (error) {
+        }  
     }
     else{
     }