Index: /trunk/src/VBox/Frontends/VirtualBox/src/widgets/UIApplianceEditorWidget.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/widgets/UIApplianceEditorWidget.cpp	(revision 66531)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/widgets/UIApplianceEditorWidget.cpp	(revision 66532)
@@ -1419,5 +1419,7 @@
 void UIApplianceEditorWidget::restoreDefaults()
 {
-    m_pModel->restoreDefaults();
+    /* Make sure model exists, it's being created in sub-classes: */
+    if (m_pModel)
+        m_pModel->restoreDefaults();
 }