GTK error messages

I'm running a wxPython program using a wx.ScrolledWindow.  I'm getting a 
lot of the following console messages:

(main.py:1170792): Gtk-CRITICAL **: 08:59:46.366: 
gtk_box_gadget_distribute: assertion 'size >= 0' failed in GtkScrollbar

I'm guessing that there is something in the way that the ScrolledWindow 
widget is initialized that is incorrect or incomplete.

Can anyone suggest how to debug this?

What's the best way to track back from a GTK error to the wxWidgets code 
triggering the error?

wxWidgets Library Version 3.1.5,  Compiled Dec 17, 2020 (using pip3).
Runtime version 3.22.  Compile-time GTK 3.22.30.

-- 
Michael Eager

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