diff -u -r ../xorg-server-1.4.0.90.orig//hw/vnc/sprite.c ./hw/vnc/sprite.c
--- ../xorg-server-1.4.0.90.orig//hw/vnc/sprite.c	2008-05-16 08:53:40.000000000 +0000
+++ ./hw/vnc/sprite.c	2008-05-16 10:10:38.000000000 +0000
@@ -2017,7 +2017,7 @@
 {
     VNCSCREENPTR(pPict->pDrawable->pScreen);
 
-    if (pPict->pDrawable->type == DRAWABLE_WINDOW)
+    if (pPict->pDrawable && pPict->pDrawable->type == DRAWABLE_WINDOW)
     {
 	WindowPtr		pWin = (WindowPtr) (pPict->pDrawable);
 	rfbSpriteScreenPtr	pScreenPriv = (rfbSpriteScreenPtr)