From 603bf1fdfd5c4474f1e338a1e48df3f21a9a48c8 Mon Sep 17 00:00:00 2001
From: Cacodemon345 <wahil1976@outlook.com>
Date: Thu, 2 Sep 2021 23:08:24 +0600
Subject: [PATCH] Port close fix to unix_sdl.c

---
 src/unix/unix_sdl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/unix/unix_sdl.c b/src/unix/unix_sdl.c
index db3b6e591..e5abdcd32 100644
--- a/src/unix/unix_sdl.c
+++ b/src/unix/unix_sdl.c
@@ -198,7 +198,8 @@ sdl_destroy_texture(void)
 void
 sdl_close(void)
 {
-    SDL_LockMutex(sdl_mutex);
+    if (sdl_mutex != NULL)
+	SDL_LockMutex(sdl_mutex);
 
     /* Unregister our renderer! */
     video_setblit(NULL);