From b141015f81d5eca118aa283a6e96d5b76937fde5 Mon Sep 17 00:00:00 2001
From: AntonioBL <antonio.lotti@alice.it>
Date: Fri, 22 Mar 2019 17:53:39 +0100
Subject: [PATCH] fix #281867 crash on Mac when stopping porttime

---
 thirdparty/portmidi/porttime/ptmacosx_cf.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/thirdparty/portmidi/porttime/ptmacosx_cf.c b/thirdparty/portmidi/porttime/ptmacosx_cf.c
index a174c864e0..fb173b6329 100644
--- a/thirdparty/portmidi/porttime/ptmacosx_cf.c
+++ b/thirdparty/portmidi/porttime/ptmacosx_cf.c
@@ -17,7 +17,7 @@
 
 static int time_started_flag = FALSE;
 static CFAbsoluteTime startTime = 0.0;
-static CFRunLoopRef timerRunLoop;
+static CFRunLoopRef timerRunLoop = 0;
 
 typedef struct {
     int resolution;
@@ -115,7 +115,10 @@ PtError Pt_Stop()
 {
     printf("Pt_Stop called\n");
 
-    CFRunLoopStop(timerRunLoop);
+    if (timerRunLoop) {
+        CFRunLoopStop(timerRunLoop);
+        timerRunLoop = 0;
+        }
     time_started_flag = FALSE;
     return ptNoError;
 }