From 96b749f2326503a34018cb34e59459c1ac9ccbd9 Mon Sep 17 00:00:00 2001
From: Paul Licameli <paul.licameli@audacityteam.org>
Date: Thu, 30 May 2019 17:37:44 -0400
Subject: [PATCH] Fix Linux assertion violation when closing Preferences

---
 src/AudioIO.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/AudioIO.cpp b/src/AudioIO.cpp
index 46e2e4083..5adf26872 100644
--- a/src/AudioIO.cpp
+++ b/src/AudioIO.cpp
@@ -2404,11 +2404,13 @@ void AudioIO::SetPlaybackMeter(AudacityProject *project, MeterPanel *meter)
    if (( mOwningProject ) && ( mOwningProject != project))
       return;
 
-   mOutputMeter = meter;
-   if (mOutputMeter)
+   if (meter)
    {
+      mOutputMeter = meter;
       mOutputMeter->Reset(mRate, true);
    }
+   else
+      mOutputMeter.Release();
 }
 
 void AudioIO::SetMeters()