diff -up SDL-1.2.14/src/video/x11/SDL_x11mouse.c~ SDL-1.2.14/src/video/x11/SDL_x11mouse.c
--- SDL-1.2.14/src/video/x11/SDL_x11mouse.c~	2009-10-13 01:07:15.000000000 +0200
+++ SDL-1.2.14/src/video/x11/SDL_x11mouse.c	2010-06-23 14:16:34.730381512 +0200
@@ -230,6 +230,10 @@ void X11_CheckMouseModeNoLock(_THIS)
 	char *env_override;
 	int enable_relative = 1;
 
+	/* This happens when quiting after an xio error */
+	if ( SDL_Display == NULL )
+	        return;
+
 	/* Allow the user to override the relative mouse mode.
 	   They almost never want to do this, as it seriously affects
 	   applications that rely on continuous relative mouse motion.
diff -up SDL-1.2.14/src/video/x11/SDL_x11wm.c~ SDL-1.2.14/src/video/x11/SDL_x11wm.c
--- SDL-1.2.14/src/video/x11/SDL_x11wm.c~	2009-10-13 01:07:15.000000000 +0200
+++ SDL-1.2.14/src/video/x11/SDL_x11wm.c	2010-06-23 14:11:55.596629337 +0200
@@ -329,7 +329,7 @@ SDL_GrabMode X11_GrabInputNoLock(_THIS, 
 {
 	int result;
 
-	if ( this->screen == NULL ) {
+	if ( this->screen == NULL || SDL_Display == NULL ) {
 		return(SDL_GRAB_OFF);
 	}
 	if ( ! SDL_Window ) {