From 079c1880b06f2adf3ad02b043f2f8529c4c8f694 Mon Sep 17 00:00:00 2001
From: Wim Looman <ghostunderscore@gmail.com>
Date: Fri, 3 Feb 2012 23:08:48 +1300
Subject: [PATCH] Fix null reference exception.

Occurred when using relative mouse mode without a focused window.
---
 src/events/SDL_mouse.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/events/SDL_mouse.c b/src/events/SDL_mouse.c
index 8a2c55c09..828b44773 100755
--- a/src/events/SDL_mouse.c
+++ b/src/events/SDL_mouse.c
@@ -323,7 +323,7 @@ SDL_SetRelativeMouseMode(SDL_bool enabled)
     /* Set the relative mode */
     mouse->relative_mode = enabled;
 
-    if (!enabled) {
+    if (!enabled && mouse->focus) {
         /* Restore the expected mouse position */
         SDL_WarpMouseInWindow(mouse->focus, mouse->x, mouse->y);
     }