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;