diff --git a/cloudflare/worker.js b/cloudflare/worker.js
index f324476873..7c3150778b 100644
--- a/cloudflare/worker.js
+++ b/cloudflare/worker.js
@@ -532,9 +532,10 @@ export default {
     }
 
     if (currentUrl.pathname === '/turing/captcha/challenge') {
-      if (currentUrl.searchParams.get('h') != '') {
-        let params = currentUrl.searchParams.delete('h');
-        targetUrl = new URL(BING_ORIGIN + '/turing/captcha/challenge' + params.search);
+      if (currentUrl.searchParams.get('h') != '' && currentUrl.searchParams.get('h') != null && currentUrl.searchParams.get('h') != undefined) {
+        let params = currentUrl.searchParams;
+        params.delete('h');
+        targetUrl = new URL(BING_ORIGIN + '/turing/captcha/challenge' + (params.toString() == '' ? '' : '?' + params.toString()));
       } else {
         return challenge(request);
       }