Index: /trunk/src/VBox/ValidationKit/testdriver/vboxwrappers.py
===================================================================
--- /trunk/src/VBox/ValidationKit/testdriver/vboxwrappers.py	(revision 60527)
+++ /trunk/src/VBox/ValidationKit/testdriver/vboxwrappers.py	(revision 60528)
@@ -2206,4 +2206,9 @@
             return False;
 
+        # Deregister event handler now, otherwise we're racing for VM process
+        # termination and cause misleading spurious error messages in the
+        # event handling code, because the event objects disappear.
+        self._deregisterEventHandler();
+
         rc = self.oTstDrv.waitOnProgress(oProgress);
         if rc < 0: