Add guard against closed peerConnection (#788)

* Add guard against closed peerConnection

* Add changeset

Author: FloEdelmann

.changeset/eighty-snakes-sneeze.md

@@ -0,0 +1,5 @@
+---
+"@epicgames-ps/lib-pixelstreamingfrontend-ue5.7": patch
+---
+
+Add guard against closed `peerConnection` in `generateStats`

Frontend/library/src/PeerConnectionController/PeerConnectionController.ts

@@ -173,9 +173,13 @@ export class PeerConnectionController {
     generateStats() {
         this.peerConnection?.getStats().then((statsData: RTCStatsReport) => {
             this.aggregatedStats.processStats(statsData);
-
             this.onVideoStats(this.aggregatedStats);
 
+            // Connection might have been closed in the meantime
+            if (!this.peerConnection) {
+                return;
+            }
+
             // Calculate latency using stats and video receivers and then call the handling function
             const latencyInfo: LatencyInfo = this.latencyCalculator.calculate(
                 this.aggregatedStats,