Comment 2 for bug 1013902

StacktraceTop:
 type_check_is_value_type_U (type=<optimized out>) at /build/buildd/glib2.0-2.33.1/./gobject/gtype.c:4106
 g_type_check_is_value_type (type=type@entry=3074205000) at /build/buildd/glib2.0-2.33.1/./gobject/gtype.c:4134
 g_value_init (value=value@entry=0xbfae1e88, g_type=g_type@entry=3074205000) at /build/buildd/glib2.0-2.33.1/./gobject/gvalue.c:173
 g_signal_emit_valist (instance=instance@entry=0x89304c8, signal_id=signal_id@entry=22, detail=detail@entry=0, var_args=var_args@entry=0xbfae1fdc "") at /build/buildd/glib2.0-2.33.1/./gobject/gsignal.c:3199
 g_signal_emit (instance=instance@entry=0x89304c8, signal_id=22, detail=detail@entry=0) at /build/buildd/glib2.0-2.33.1/./gobject/gsignal.c:3352