Index: /trunk/src/VBox/Frontends/VirtualBox/src/runtime/UIMachineLogic.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/runtime/UIMachineLogic.cpp	(revision 55749)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/runtime/UIMachineLogic.cpp	(revision 55750)
@@ -1429,5 +1429,7 @@
         {
             /* Show the take-snapshot progress: */
-            msgCenter().showModalProgressDialog(progress, machineName(), ":/progress_snapshot_create_90px.png");
+            const bool fStillValid = msgCenter().showModalProgressDialog(progress, machineName(), ":/progress_snapshot_create_90px.png");
+            if (!fStillValid)
+                return;
             if (!progress.isOk() || progress.GetResultCode() != 0)
                 msgCenter().cannotTakeSnapshot(progress, machineName());