Index: /trunk/src/VBox/Devices/Storage/DrvVD.cpp
===================================================================
--- /trunk/src/VBox/Devices/Storage/DrvVD.cpp	(revision 51922)
+++ /trunk/src/VBox/Devices/Storage/DrvVD.cpp	(revision 51923)
@@ -1693,4 +1693,6 @@
             rc = VDFilterRemove(pThis->pDisk);
             AssertRC(rc);
+
+            pThis->pIfSecKey = NULL;
         }
 
@@ -1703,5 +1705,5 @@
                                 pThis->pCfgCrypto, sizeof(VDINTERFACECONFIG), &pVDIfFilter);
             AssertRC(rc);
-    
+
             rc = VDInterfaceAdd(&pThis->VDIfCrypto.Core, "DrvVD_Crypto", VDINTERFACETYPE_CRYPTO,
                                 pThis, sizeof(VDINTERFACECRYPTO), &pVDIfFilter);