From a28b4cc1faa6ef839f62ab2fec3656bccb0693b7 Mon Sep 17 00:00:00 2001
From: Paul McCarthy <pauldmccarthy@gmail.com>
Date: Mon, 29 May 2017 22:40:23 +0100
Subject: [PATCH] Only run DoUpdate if the managed window exists.

---
 wx/lib/agw/aui/framemanager.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/wx/lib/agw/aui/framemanager.py b/wx/lib/agw/aui/framemanager.py
index a887bdc1..5d10711f 100644
--- a/wx/lib/agw/aui/framemanager.py
+++ b/wx/lib/agw/aui/framemanager.py
@@ -6360,6 +6360,10 @@ class AuiManager(wx.EvtHandler):
         must be called. This construction allows pane flicker to be avoided by updating
         the whole layout at one time.
         """
+
+        if not self.GetManagedWindow():
+            return
+
         if '__WXGTK__' in wx.PlatformInfo:
             self.GetManagedWindow().Freeze()
         self._hover_button = None