Comment 2 for bug 922559

StacktraceTop:
 g_assertion_message (domain=<optimized out>, file=<optimized out>, line=<optimized out>, func=0x7f4702679440 "handler_unref_R", message=0x7f46e402d470 "assertion failed: (hlist->tail_before == handler)") at /build/buildd/glib2.0-2.31.12/./glib/gtestutils.c:1860
 g_assertion_message_expr (domain=0x7f4702672e4f "GLib-GObject", file=0x7f4702677940 "/build/buildd/glib2.0-2.31.12/./gobject/gsignal.c", line=619, func=0x7f4702679440 "handler_unref_R", expr=<optimized out>) at /build/buildd/glib2.0-2.31.12/./glib/gtestutils.c:1871
 handler_unref_R (handler=0x1ef0b60, instance=0x1ed9a40, signal_id=<optimized out>) at /build/buildd/glib2.0-2.31.12/./gobject/gsignal.c:619
 handler_match_free1_R (instance=0x1ed9a40, node=0x1dfd4c0) at /build/buildd/glib2.0-2.31.12/./gobject/gsignal.c:466
 signal_handlers_foreach_matched_R (instance=0x1ed9a40, mask=<optimized out>, signal_id=<optimized out>, detail=<optimized out>, closure=<optimized out>, func=<optimized out>, data=0x20f5980, callback=0x7f470265a820 <g_signal_handler_disconnect>) at /build/buildd/glib2.0-2.31.12/./gobject/gsignal.c:2588