From 02a962207bca0c9719a5e28d10881ecb16a9ca9e Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Mon, 12 Mar 2012 10:11:27 +0100
Subject: [PATCH] Fix possible crash when cleaning up MDI views

---
 src/Gui/MDIView.cpp | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/src/Gui/MDIView.cpp b/src/Gui/MDIView.cpp
index 6aef8cd64e..3b7c07b602 100644
--- a/src/Gui/MDIView.cpp
+++ b/src/Gui/MDIView.cpp
@@ -56,15 +56,17 @@ MDIView::~MDIView()
     //the application crashes when accessing this deleted view.
     //This effect only occurs if this widget is not in Child mode, because otherwise
     //the focus stuff is done correctly.
-    QWidget* foc = getMainWindow()->focusWidget();
-    if (foc) {
-        QWidget* par = foc;
-        while (par) {
-            if (par == this) {
-                getMainWindow()->setFocus();
-                break;
+    if (getMainWindow()) {
+        QWidget* foc = getMainWindow()->focusWidget();
+        if (foc) {
+            QWidget* par = foc;
+            while (par) {
+                if (par == this) {
+                    getMainWindow()->setFocus();
+                    break;
+                }
+                par = par->parentWidget();
             }
-            par = par->parentWidget();
         }
     }
 }