--- hw/xfree86/common/xf86VidMode.c.orig	2008-11-06 17:46:03.000000000 +0100
+++ hw/xfree86/common/xf86VidMode.c	2008-11-06 17:48:54.000000000 +0100
@@ -225,6 +225,8 @@ VidModeGetFirstModeline(int scrnIndex, p
 
     pScrn = xf86Screens[scrnIndex];
     pVidMode = VMPTR(pScrn->pScreen);
+    if (!pScrn->modes)
+	return FALSE;
     pVidMode->First = pScrn->modes;
     pVidMode->Next =  pVidMode->First->next;