Index: /trunk/src/VBox/Main/src-client/AudioDriver.cpp
===================================================================
--- /trunk/src/VBox/Main/src-client/AudioDriver.cpp	(revision 70582)
+++ /trunk/src/VBox/Main/src-client/AudioDriver.cpp	(revision 70583)
@@ -279,5 +279,7 @@
     AssertPtr(pRoot);
     PCFGMNODE pDev0   = CFGMR3GetChildF(pRoot, "Devices/%s/%u/", mCfg.strDev.c_str(), mCfg.uInst);
-    AssertPtr(pDev0);
+
+    if (!pDev0) /* No audio device configured? Bail out. */
+        return VINF_SUCCESS;
 
     PCFGMNODE pDevLun = CFGMR3GetChildF(pDev0, "LUN#%u/", uLUN);