Hi.

After the user session expires (session timeout), when I click on "Cancel" 
button in the dialog information window, Tryton displays me an info window 
with the message "The following action requires to close all tabs. Do you 
want to continue?". Then I click on button "OK" of that message window, 
I get this error:


'NoneType' object has no attribute 'set'

  File "tryton/gui/window/form.py", line 302, in sig_new
    self.screen.new()

  File "tryton/gui/window/view_form/screen/screen.py", line 447, in new
    self.switch_view('form')

  File "tryton/gui/window/view_form/screen/screen.py", line 378, in 
switch_view
    self.screen_container.set(self.current_view.widget)



I'm testing it with Trytond 3.0.4 and Tryton 3.0.3

Thanks

--
Regards
Fabyc

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