[GI] Error when I close the interface Glade/GTK3/

[Charles25]

Hello again
I found the error
It's about the auto completion, I correct the code

self.liststoreMedoc = Gtk.ListStore(str)
self.liststoreMedoc2 = Gtk.ListStore(str)
for s in list(sum(self.ListeMedoc,())):
    self.liststoreMedoc.append([s])
    self.liststoreMedoc2.append([s])
self.autocompletemedoc = Gtk.EntryCompletion()
self.autocompletemedoc2 = Gtk.EntryCompletion()
self.autocompletemedoc.set_model(self.liststoreMedoc)
self.autocompletemedo2c.set_model(self.liststoreMedoc2)
self.autocompletemedoc.set_text_column(0)
self.autocompletemedoc2.set_text_column(0)
self.builder.get_object("EntreMedoc1").set_completion(self.autocompletemedoc)
self.builder.get_object("EntreMedoc2").set_completion(self.autocompletemedoc2)