From 276c7efe5851a8f8de04af3fa56bff052025ca20 Mon Sep 17 00:00:00 2001
From: Antony Lee <anntzer.lee@gmail.com>
Date: Sat, 11 Apr 2020 14:03:42 +0200
Subject: [PATCH] Avoid "wrapped C/C++ object has been deleted" when closing wx
 window.

A RuntimeError is otherwise triggered when closing a wx window by
clicking the "x" button on the top right.  Bisects to bce6263 which
fixed another issue with wx...
---
 lib/matplotlib/backends/backend_wx.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/matplotlib/backends/backend_wx.py b/lib/matplotlib/backends/backend_wx.py
index 63c02979a6e8..cf251da531ce 100644
--- a/lib/matplotlib/backends/backend_wx.py
+++ b/lib/matplotlib/backends/backend_wx.py
@@ -1058,7 +1058,9 @@ def show(self):
     def destroy(self, *args):
         # docstring inherited
         _log.debug("%s - destroy()", type(self))
-        self.frame.Close()
+        frame = self.frame
+        if frame:  # Else, may have been already deleted, e.g. when closing.
+            frame.Close()
         wxapp = wx.GetApp()
         if wxapp:
             wxapp.Yield()