diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index 6e65ac0..06975ac 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -746,7 +746,7 @@
         output.afFrameCount = thread->frameCount();
         output.afSampleRate = thread->sampleRate();
         output.afLatencyMs = thread->latency();
-        output.trackId = track->id();
+        output.trackId = track == nullptr ? -1 : track->id();
 
         // move effect chain to this output thread if an effect on same session was waiting
         // for a track to be created