Clutter critical issue when windows is closed.

[Román <rgmf riseup net>]

Hi everyone,

I'm writing a PyGtk application and I've embedded a map with 
libchamplain library but I have an issue I don't know how to fix.

This is the class and it works well: https://pastebin.com/XFsfZ2Bz

But if I remove the line 142 then when I closed the Gtk Window (I close 
the application) I get these messages on the shell:

(pyopentracks:46950): Clutter-CRITICAL **: 19:45:14.934: 
clutter_actor_set_size: assertion 'CLUTTER_IS_ACTOR (self)' failed

(pyopentracks:46950): Clutter-CRITICAL **: 19:45:14.934: 
clutter_actor_set_size: assertion 'CLUTTER_IS_ACTOR (self)' failed

(pyopentracks:46950): Clutter-CRITICAL **: 19:45:14.934: 
clutter_canvas_set_size: assertion 'CLUTTER_IS_CANVAS (canvas)' failed

(pyopentracks:46950): Clutter-CRITICAL **: 19:45:14.934: 
clutter_content_invalidate: assertion 'CLUTTER_IS_CONTENT (content)' failed

(pyopentracks:46950): Clutter-CRITICAL **: 19:45:14.934: 
clutter_actor_hide: assertion 'CLUTTER_IS_ACTOR (self)' failed


What it's really strange and the error must be hidden because that 
doesn't make any sense.

Could anyone give me a clue?

Thank you ;)