Index: /trunk/src/VBox/Main/MachineImpl.cpp
===================================================================
--- /trunk/src/VBox/Main/MachineImpl.cpp	(revision 23582)
+++ /trunk/src/VBox/Main/MachineImpl.cpp	(revision 23583)
@@ -9501,7 +9501,8 @@
                 Assert(pReplaceMachineId  && *pReplaceMachineId == mData->mUuid);
 
+                Guid snapshotId;
                 const Guid *pSnapshotId = replaceHd->getFirstMachineBackrefSnapshotId();
-                Assert(pSnapshotId);
-                Guid snapshotId = *pSnapshotId;
+                if (pSnapshotId)
+                    snapshotId = *pSnapshotId;
 
                 HRESULT rc2 = S_OK;