Created attachment 4059 Proposed patch to fix critical log message on close When pushing the quit button everything works as expected, but when closing the mixer window either from the close button or an alt-f4 combo an error message is printed: Gtk-CRITICAL **: IA__gtk_widget_destroy: assertion `GTK_IS_WIDGET (widget)' failed This patch adds a check to see if the window was destroyed before attempting to destroy it again.
Fixed in commit f9ca75a7dedad8eaef97c0a1a11d397664bae78a.