was no label widget or the lable widget was not a #GtkLabel. This string is owned by GTK+ and must not be modified or freed.
Frame.getLabel
string getLabel()If the frame’s label widget is a #GtkLabel, returns the text in the label widget. (The frame will have a #GtkLabel for the label widget if a non-null argument was passed to [gtk.frame.Frame.new_].)
Returns
the text in the label, or null if there