From 16f32ee7652c15bdbe46a85cdc0ecf036bd4003e Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Mon, 27 Nov 2006 16:36:09 +0000
Subject: [PATCH] avoid assert in DoGetBestSize() for an empty tree

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@43689 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 src/common/treebase.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/common/treebase.cpp b/src/common/treebase.cpp
index 38d242bf06..08220fa503 100644
--- a/src/common/treebase.cpp
+++ b/src/common/treebase.cpp
@@ -162,7 +162,9 @@ wxSize wxTreeCtrlBase::DoGetBestSize() const
     else // use precise, if potentially slow, size computation method
     {
         // iterate over all items recursively
-        wxGetBestTreeSize(this, GetRootItem(), size);
+        wxTreeItemId idRoot = GetRootItem();
+        if ( idRoot.IsOk() )
+            wxGetBestTreeSize(this, idRoot, size);
     }
 
     // need some minimal size even for empty tree
-- 
2.50.0