From 27caa5769530cd2f003b4c8a81a8e5e1d5a4fd68 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <icculus@icculus.org>
Date: Mon, 21 Jul 2025 16:02:42 -0400
Subject: [PATCH] dialog: Make sure we don't underflow a string in Cocoa
 backend.

Fixes #13014.
---
 src/dialog/cocoa/SDL_cocoadialog.m | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/dialog/cocoa/SDL_cocoadialog.m b/src/dialog/cocoa/SDL_cocoadialog.m
index 4ae894cddf..f1b9c3bbaa 100644
--- a/src/dialog/cocoa/SDL_cocoadialog.m
+++ b/src/dialog/cocoa/SDL_cocoadialog.m
@@ -157,7 +157,7 @@ void SDL_SYS_ShowFileDialogWithProperties(SDL_FileDialogType type, SDL_DialogFil
     // Keep behavior consistent with other platforms
     [dialog setAllowsOtherFileTypes:YES];
 
-    if (default_location) {
+    if (default_location && *default_location) {
         char last = default_location[SDL_strlen(default_location) - 1];
         NSURL* url = [NSURL fileURLWithPath:[NSString stringWithUTF8String:default_location]];
         if (last == '/') {