diff --git a/lib/client/http-tracker.js b/lib/client/http-tracker.js
index 678f7a2..db2ceeb 100644
--- a/lib/client/http-tracker.js
+++ b/lib/client/http-tracker.js
@@ -129,7 +129,7 @@ class HTTPTracker extends Tracker {
     }
 
     const cleanup = () => {
-      if (!controller.signal.aborted) {
+      if (!controller?.signal && !controller.signal.aborted) {
         arrayRemove(this.cleanupFns, this.cleanupFns.indexOf(cleanup))
         controller.abort()
         controller = null