AUI error: any pushed event handlers must have been removed

I'm trying to work with AUI and keep getting the following error...

wx._core.wxAssertionError: C++ assertion "GetEventHandler() == this" failed 
at 
/usr/local/miniconda/conda-bld/wxpython_1585592756259/work/ext/wxWidgets/src/common/wincmn.cpp(478) 

in ~wxWindowBase(): any pushed event handlers must have been removed

I've reduced my code down to a simple program that reproduces the error 
(below).  Please note that the "MyFrame" definition is auto-generated by 
wxFormBuilder, so I'm only supposed to modify that through subclasses.

I've found references to this error on the internet, but none of the 
solutions seem to match my case.

Where am I going wrong?

Thanks,
Eric

import wx
import wx.xrc
import wx.aui


# Code for the frame was auto-generated by wxFormBuilder

class MyFrame1(wx.Frame):

    def __init__(self, parent):
        wx.Frame.__init__(self, parent, id=wx.ID_ANY, title=wx.EmptyString, 
pos=wx.DefaultPosition,
                          size=wx.Size(870, 700), style=wx.DEFAULT_FRAME_STYLE 
| wx.TAB_TRAVERSAL)

        self.SetSizeHints(wx.DefaultSize, wx.DefaultSize)
        self.m_mgr = wx.aui.AuiManager()
        self.m_mgr.SetManagedWindow(self)
        self.m_mgr.SetFlags(wx.aui.AUI_MGR_DEFAULT)

        self.m_mgr.Update()
        self.Centre(wx.BOTH)

    def __del__(self):
        self.m_mgr.UnInit()


class MyApp(wx.App):

    def OnInit(self):
        self.frame = MyFrame1(None)
        self.SetTopWindow(self.frame)
        self.frame.Show(True)
        return True

# 
-------------------------------------------------------------------------------

def main():
    app = MyApp(False)
    app.MainLoop()

# 
-------------------------------------------------------------------------------

if __name__ == "__main__":
    main()






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