diff --git a/pkg/rtc/transportmanager.go b/pkg/rtc/transportmanager.go
index ce01ac765..8257c1023 100644
--- a/pkg/rtc/transportmanager.go
+++ b/pkg/rtc/transportmanager.go
@@ -560,6 +560,11 @@ func (t *TransportManager) ProcessPendingPublisherOffer() {
 }
 
 func (t *TransportManager) HandleAnswer(answer webrtc.SessionDescription, answerId uint32) {
+	if t.subscriber == nil {
+		// no subscriber transport in single-PC / one-shot signalling mode
+		t.params.Logger.Warnw("answer received, but no subscriber peer connection", nil)
+		return
+	}
 	t.subscriber.HandleRemoteDescription(answer, answerId)
 }