diff --git a/ext/src/background/whitelist.ts b/ext/src/background/whitelist.ts
index df4a15e..3d8c374 100644
--- a/ext/src/background/whitelist.ts
+++ b/ext/src/background/whitelist.ts
@@ -138,7 +138,7 @@ function onWhitelistedChildBeforeSendHeaders(
  * the API shim.
  */
 async function onBeforeCastSDKRequest(details: OnBeforeRequestDetails) {
-    if (!details.originUrl) {
+    if (!details.originUrl || details.tabId === -1) {
         return {};
     }