Index: /trunk/src/VBox/Frontends/VBoxManage/VBoxManageModifyVM.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VBoxManage/VBoxManageModifyVM.cpp	(revision 42380)
+++ /trunk/src/VBox/Frontends/VBoxManage/VBoxManageModifyVM.cpp	(revision 42381)
@@ -413,5 +413,5 @@
 
     /* get the mutable session machine */
-    a->session->COMGETTER(Machine)(machine.asOutParam());
+    CHECK_ERROR_RET(a->session, COMGETTER(Machine)(machine.asOutParam()), 1);
     machine->COMGETTER(BIOSSettings)(biosSettings.asOutParam());