diff --git a/packages/transport-web-serial/src/transport.ts b/packages/transport-web-serial/src/transport.ts
index 49b55ebe..949e4d5c 100644
--- a/packages/transport-web-serial/src/transport.ts
+++ b/packages/transport-web-serial/src/transport.ts
@@ -163,7 +163,7 @@ export class TransportWebSerial implements Types.Transport {
       }
 
       // Cancel any remaining streams
-      if (this._fromDevice && this._fromDevice.locked) {
+      if (this._fromDevice?.locked) {
         try {
           await this._fromDevice.cancel();
         } catch {