From 60846b2b7aabcf1406d763c7e7f9155481f9783d Mon Sep 17 00:00:00 2001
From: David Geldreich <david.geldreich@free.fr>
Date: Fri, 15 Jul 2022 19:35:32 +0200
Subject: [PATCH] correct an issue of trackbar on macOS

Python binding is passing NULL as (int*)value.
sliderChanged crash when trying to dereference value
---
 modules/highgui/src/window_cocoa.mm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/modules/highgui/src/window_cocoa.mm b/modules/highgui/src/window_cocoa.mm
index e9cf5a3c1b..ef3f828cf8 100644
--- a/modules/highgui/src/window_cocoa.mm
+++ b/modules/highgui/src/window_cocoa.mm
@@ -1201,7 +1201,7 @@ static NSSize constrainAspectRatio(NSSize base, NSSize constraint) {
     (void)notification;
     int pos = [slider intValue];
     NSString *temp = [self initialName];
-    NSString *text = [NSString stringWithFormat:@"%@ %d", temp, *value];
+    NSString *text = [NSString stringWithFormat:@"%@ %d", temp, pos];
     [name setStringValue: text];
     if(value)
         *value = pos;