diff --git a/src/common/docmdi.cpp b/src/common/docmdi.cpp
index 29f89756d0..2beef44f1b 100644
--- a/src/common/docmdi.cpp
+++ b/src/common/docmdi.cpp
@@ -80,15 +80,17 @@ bool wxDocMDIParentFrame::ProcessEvent(wxEvent& event)
 
 void wxDocMDIParentFrame::OnCloseWindow(wxCloseEvent& event)
 {
-  if (m_docManager->Clear(!event.CanVeto()))
-  {
-    this->Destroy();
-  }
-  else
-    event.Veto();
+    if ( m_docManager && !m_docManager->Clear(!event.CanVeto()) )
+    {
+        // The user decided not to close finally, abort.
+        event.Veto();
+    }
+    else
+    {
+        this->Destroy();
+    }
 }
 
-
 /*
  * Default document child frame for MDI children
  */
diff --git a/src/common/docview.cpp b/src/common/docview.cpp
index f86e650727..d53f01c9d4 100644
--- a/src/common/docview.cpp
+++ b/src/common/docview.cpp
@@ -2010,12 +2010,15 @@ bool wxDocParentFrame::ProcessEvent(wxEvent& event)
 // - must delete all frames except for the main one.
 void wxDocParentFrame::OnCloseWindow(wxCloseEvent& event)
 {
-    if (m_docManager->Clear(!event.CanVeto()))
+    if ( m_docManager && !m_docManager->Clear(!event.CanVeto()) )
+    {
+        // The user decided not to close finally, abort.
+        event.Veto();
+    }
+    else
     {
         this->Destroy();
     }
-    else
-        event.Veto();
 }
 
 #if wxUSE_PRINTING_ARCHITECTURE