Index: /trunk/src/VBox/Devices/Graphics/DevVGA_VDMA.cpp
===================================================================
--- /trunk/src/VBox/Devices/Graphics/DevVGA_VDMA.cpp	(revision 41291)
+++ /trunk/src/VBox/Devices/Graphics/DevVGA_VDMA.cpp	(revision 41292)
@@ -159,5 +159,6 @@
 static int vboxVDMACrCtlPostAsync (PVGASTATE pVGAState, PVBOXVDMACMD_CHROMIUM_CTL pCmd, uint32_t cbCmd, PFNVBOXVDMACRCTL_CALLBACK pfnCompletion, void *pvCompletion)
 {
-    if (pVGAState->pDrv->pfnCrHgsmiControlProcess)
+    if (   pVGAState->pDrv
+        && pVGAState->pDrv->pfnCrHgsmiControlProcess)
     {
         PVBOXVDMACMD_CHROMIUM_CTL_PRIVATE pHdr = VBOXVDMACMD_CHROMIUM_CTL_PRIVATE_FROM_CTL(pCmd);