StacktraceTop: g_type_check_instance_cast (type_instance=0xb6b20620, iface_type=135088432) at /build/buildd/glib2.0-2.29.16/./gobject/gtype.c:3985 notify_cb (obj=0x81832a8, pspec=0x80cc600) at /build/buildd/gtk+3.0-3.1.12/./gtk/a11y/gtkwidgetaccessible.c:62 g_cclosure_marshal_VOID__PARAM (closure=0x8213150, return_value=0x0, n_param_values=2, param_values=0x821af90, invocation_hint=0xbf92e7b0, marshal_data=0x0) at /build/buildd/glib2.0-2.29.16/./gobject/gmarshal.c:539 g_closure_invoke (closure=0x8213150, return_value=0x0, n_param_values=2, param_values=0x821af90, invocation_hint=0xbf92e7b0) at /build/buildd/glib2.0-2.29.16/./gobject/gclosure.c:773 signal_emit_unlocked_R (node=0x80c23d8, detail=96, instance=0x81832a8, emission_return=0x0, instance_and_params=0x821af90) at /build/buildd/glib2.0-2.29.16/./gobject/gsignal.c:3271
StacktraceTop: check_instance_ cast (type_instance= 0xb6b20620, iface_type= 135088432) at /build/ buildd/ glib2.0- 2.29.16/ ./gobject/ gtype.c: 3985 buildd/ gtk+3.0- 3.1.12/ ./gtk/a11y/ gtkwidgetaccess ible.c: 62 marshal_ VOID__PARAM (closure=0x8213150, return_value=0x0, n_param_values=2, param_values= 0x821af90, invocation_ hint=0xbf92e7b0 , marshal_data=0x0) at /build/ buildd/ glib2.0- 2.29.16/ ./gobject/ gmarshal. c:539 0x821af90, invocation_ hint=0xbf92e7b0 ) at /build/ buildd/ glib2.0- 2.29.16/ ./gobject/ gclosure. c:773 emit_unlocked_ R (node=0x80c23d8, detail=96, instance=0x81832a8, emission_ return= 0x0, instance_ and_params= 0x821af90) at /build/ buildd/ glib2.0- 2.29.16/ ./gobject/ gsignal. c:3271
g_type_
notify_cb (obj=0x81832a8, pspec=0x80cc600) at /build/
g_cclosure_
g_closure_invoke (closure=0x8213150, return_value=0x0, n_param_values=2, param_values=
signal_