Index: /trunk/src/VBox/VMM/VMMRZ/VMMRZ.cpp
===================================================================
--- /trunk/src/VBox/VMM/VMMRZ/VMMRZ.cpp	(revision 45329)
+++ /trunk/src/VBox/VMM/VMMRZ/VMMRZ.cpp	(revision 45330)
@@ -86,6 +86,9 @@
     pVM->vmm.s.pfnRCToHost(VINF_VMM_CALL_HOST);
 #else
-    if (pVCpu->vmm.s.pfnCallRing3CallbackR0)
+    if (   pVCpu->vmm.s.pfnCallRing3CallbackR0
+        && enmOperation != VMMCALLRING3_VM_R0_ASSERTION)
+    {
         pVCpu->vmm.s.pfnCallRing3CallbackR0(pVCpu, enmOperation, pVCpu->vmm.s.pvCallRing3CallbackUserR0);
+    }
     int rc = vmmR0CallRing3LongJmp(&pVCpu->vmm.s.CallRing3JmpBufR0, VINF_VMM_CALL_HOST);
     if (RT_FAILURE(rc))