Comment 2 for bug 1058764

StacktraceTop:
 g_type_interfaces (type=type@entry=137838624, n_interfaces=n_interfaces@entry=0xbfcbb69c) at /build/buildd/glib2.0-2.34.0/./gobject/gtype.c:3581
 signal_id_lookup (itype=137838624, quark=<optimized out>) at /build/buildd/glib2.0-2.34.0/./gobject/gsignal.c:345
 signal_parse_name (detail_p=<synthetic pointer>, itype=137838624, name=0x8089353 "closed", force_quark=<optimized out>) at /build/buildd/glib2.0-2.34.0/./gobject/gsignal.c:1044
 signal_parse_name (force_quark=1, detail_p=<synthetic pointer>, itype=137838624, name=0x8089353 "closed") at /build/buildd/glib2.0-2.34.0/./gobject/gsignal.c:3374
 g_signal_emit_by_name (instance=instance@entry=0x8374110, detailed_signal=detailed_signal@entry=0x8089353 "closed") at /build/buildd/glib2.0-2.34.0/./gobject/gsignal.c:3385