From ed88275a88c3e219c9d4252477a28589575dab44 Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Sat, 28 Oct 2017 22:59:58 +0200
Subject: [PATCH] Ensure we don't crash in wxProgressDialog::DoGetPosition()

Check that we do have the shared data before dereferencing the pointer
to it. While this normally will always be the case, it could be null if
some error happened, so add a check for it, just as we already do it
elsewhere.
---
 src/msw/progdlg.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/msw/progdlg.cpp b/src/msw/progdlg.cpp
index 3f2b36328b..ab7d57e8c3 100644
--- a/src/msw/progdlg.cpp
+++ b/src/msw/progdlg.cpp
@@ -746,6 +746,7 @@ void wxProgressDialog::DoGetPosition(int *x, int *y) const
     if ( HasNativeTaskDialog() )
     {
         wxPoint pos;
+        if ( m_sharedData )
         {
             wxCriticalSectionLocker locker(m_sharedData->m_cs);
             pos = m_sharedData->m_winPosition;