Index: /trunk/src/VBox/Main/src-client/ConsoleImpl.cpp
===================================================================
--- /trunk/src/VBox/Main/src-client/ConsoleImpl.cpp	(revision 46806)
+++ /trunk/src/VBox/Main/src-client/ConsoleImpl.cpp	(revision 46807)
@@ -1233,7 +1233,11 @@
         uint32_t u32GuestFlags = VMMDEV_SETCREDENTIALS_GUESTLOGON;
 
-        int rc = m_pVMMDev->getVMMDevPort()->pfnSetCredentials(m_pVMMDev->getVMMDevPort(),
-                     pszUser, pszPassword, pszDomain, u32GuestFlags);
-        AssertRC(rc);
+        PPDMIVMMDEVPORT pDevPort = m_pVMMDev->getVMMDevPort();
+        if (pDevPort)
+        {
+            int rc = pDevPort->pfnSetCredentials(m_pVMMDev->getVMMDevPort(),
+                                                 pszUser, pszPassword, pszDomain, u32GuestFlags);
+            AssertRC(rc);
+        }
     }