g_type_check_instance (type_instance=0x1b4e540) at /build/buildd/glib2.0-2.32.0/./gobject/gtype.c:4073
g_signal_emit_valist (instance=0x1b4e540, signal_id=218, detail=0, var_args=0x7fffbbcddd88) at /build/buildd/glib2.0-2.32.0/./gobject/gsignal.c:3083
g_signal_emit (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>) at /build/buildd/glib2.0-2.32.0/./gobject/gsignal.c:3352
?? ()
?? ()