Comment 2 for bug 966903

StacktraceTop:
 lookup_type_node_I (utype=140734193761480) at /build/buildd/glib2.0-2.32.0/./gobject/gtype.c:400
 g_type_class_get_private (klass=0x2b14180, private_type=215) at /build/buildd/glib2.0-2.32.0/./gobject/gtype.c:4642
 signal_parse_name (force_quark=1, detail_p=<synthetic pointer>, itype=140733193388033, name=0x7fff3ba07cb0 "\360_Y\245\225\177") at /usr/include/x86_64-linux-gnu/bits/string3.h:52
 g_signal_emit_by_name (instance=0x45bc820, detailed_signal=0x7fff3ba07cb0 "\360_Y\245\225\177") at /build/buildd/glib2.0-2.32.0/./gobject/gsignal.c:3381
 g_strconcat (string1=0x73 <Address 0x73 out of bounds>) at /build/buildd/glib2.0-2.32.0/./glib/gstrfuncs.c:586