diff --git a/src/js/scriptlet-filtering-core.js b/src/js/scriptlet-filtering-core.js
index f0d9164dc..75818eb97 100644
--- a/src/js/scriptlet-filtering-core.js
+++ b/src/js/scriptlet-filtering-core.js
@@ -259,12 +259,6 @@ export class ScriptletFilteringEngine {
         $mainWorldMap.clear();
         $isolatedWorldMap.clear();
 
-        if ( scriptletDetails.mainWorld === '' ) {
-            if ( scriptletDetails.isolatedWorld === '' ) {
-                return { filters: scriptletDetails.filters };
-            }
-        }
-    
         const scriptletGlobals = options.scriptletGlobals || {};
 
         if ( options.debug ) {
diff --git a/src/js/scriptlet-filtering.js b/src/js/scriptlet-filtering.js
index b12eb49d9..f23049257 100644
--- a/src/js/scriptlet-filtering.js
+++ b/src/js/scriptlet-filtering.js
@@ -335,10 +335,10 @@ export class ScriptletFilteringEngineEx extends ScriptletFilteringEngine {
         }
 
         const contentScript = [];
-        if ( scriptletDetails.mainWorld !== '' ) {
+        if ( scriptletDetails.mainWorld ) {
             contentScript.push(mainWorldInjector.assemble(hostname, scriptletDetails));
         }
-        if ( scriptletDetails.isolatedWorld !== '' ) {
+        if ( scriptletDetails.isolatedWorld ) {
             contentScript.push(isolatedWorldInjector.assemble(hostname, scriptletDetails));
         }
 
@@ -373,6 +373,9 @@ export class ScriptletFilteringEngineEx extends ScriptletFilteringEngine {
             contentScriptRegisterer.unregister(hostname);
             return;
         }
+        if ( Boolean(scriptletDetails.code) === false ) {
+            return scriptletDetails;
+        }
 
         const contentScript = [ scriptletDetails.code ];
         if ( logger.enabled ) {