From 40538446d903c521ae23d41327b2cc6ce708bb06 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Sat, 7 Jun 2014 17:31:50 -0700
Subject: [PATCH] Fixed crash with SDL_SetError(NULL)

---
 src/stdlib/SDL_string.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/stdlib/SDL_string.c b/src/stdlib/SDL_string.c
index 733a2571abe79..dd0eab1d02b08 100644
--- a/src/stdlib/SDL_string.c
+++ b/src/stdlib/SDL_string.c
@@ -1468,6 +1468,9 @@ SDL_vsnprintf(SDL_OUT_Z_CAP(maxlen) char *text, size_t maxlen, const char *fmt,
     size_t left = maxlen;
     char *textstart = text;
 
+    if (!fmt) {
+        fmt = "";
+    }
     while (*fmt) {
         if (*fmt == '%') {
             SDL_bool done = SDL_FALSE;