diff --git a/src/js/redirect-engine.js b/src/js/redirect-engine.js
index 14df52200..f484214d1 100644
--- a/src/js/redirect-engine.js
+++ b/src/js/redirect-engine.js
@@ -210,6 +210,7 @@ class RedirectEngine {
         const entry = this.resources.get(this.aliases.get(name) || name);
         if ( entry === undefined ) { return; }
         if ( entry.mime.startsWith(mime) === false ) { return; }
+        if ( entry.data === undefined ) { return; }
         return {
             js: entry.toContent(),
             world: entry.world,
diff --git a/src/js/redirect-resources.js b/src/js/redirect-resources.js
index b1a24c61f..f1dd5c27d 100644
--- a/src/js/redirect-resources.js
+++ b/src/js/redirect-resources.js
@@ -94,6 +94,7 @@ export default new Map([
     } ],
     [ 'google-ima.js', {
         alias: 'google-ima3',                       /* adguard compatibility */
+        data: 'text',
     } ],
     [ 'googlesyndication_adsbygoogle.js', {
         alias: [