From 2f3b119caa0cea5dbf88930fb520c693eafd1d17 Mon Sep 17 00:00:00 2001
From: Paul Licameli <paul.licameli@audacityteam.org>
Date: Sun, 14 Jul 2019 12:00:33 -0400
Subject: [PATCH] Bug2129 residual: click effect Preview button make Linux
 assert failure

---
 src/AudioIO.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/AudioIO.cpp b/src/AudioIO.cpp
index 32a5b4e7f..082b292b9 100644
--- a/src/AudioIO.cpp
+++ b/src/AudioIO.cpp
@@ -1286,7 +1286,10 @@ bool AudioIO::StartPortAudioStream(const AudioIOStartStreamOptions &options,
          playbackParameters.suggestedLatency = isWASAPI ? 0.0 : latencyDuration/1000.0;
       }
 
-      mOutputMeter = options.playbackMeter;
+      if ( options.playbackMeter )
+         mOutputMeter = options.playbackMeter;
+      else
+         mOutputMeter.Release();
    }
 
    if( numCaptureChannels > 0)