From 0a33446c8e71292bfdb960ed7e26e1f196938cf0 Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Thu, 3 Jan 2002 17:39:28 +0000
Subject: [PATCH] don't crash in UnselectAll() if the tree has no root

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@13337 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 src/generic/treectlg.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/generic/treectlg.cpp b/src/generic/treectlg.cpp
index 86535a229f..64e615f681 100644
--- a/src/generic/treectlg.cpp
+++ b/src/generic/treectlg.cpp
@@ -1477,7 +1477,13 @@ void wxGenericTreeCtrl::UnselectAllChildren(wxGenericTreeItem *item)
 
 void wxGenericTreeCtrl::UnselectAll()
 {
-    UnselectAllChildren((wxGenericTreeItem*) GetRootItem().m_pItem);
+    wxTreeItemId rootItem = GetRootItem();
+
+    // the tree might not have the root item at all
+    if ( rootItem )
+    {
+        UnselectAllChildren((wxGenericTreeItem*) rootItem.m_pItem);
+    }
 }
 
 // Recursive function !
-- 
2.47.2