diff --git a/lib/channel-postmessage/src/index.ts b/lib/channel-postmessage/src/index.ts
index c23774c4dd8..f37703bdae1 100644
--- a/lib/channel-postmessage/src/index.ts
+++ b/lib/channel-postmessage/src/index.ts
@@ -84,7 +84,7 @@ export class PostmsgTransport {
         this.buffer.push({ event, resolve, reject });
       });
     }
-    if (frames.length && this.buffer.length) {
+    if (this.buffer.length) {
       this.flush();
     }