Comment 2 for bug 839056

StacktraceTop:
 g_assertion_message (domain=<optimized out>, file=<optimized out>, line=<optimized out>, func=0x7f070a91d9e0 "append_value_to_blob", message=0x7f06f8100010 "assertion failed: (g_utf8_validate (v, -1, &end) && (end == v + len))") at /build/buildd/glib2.0-2.28.6/./glib/gtestutils.c:1358
 g_assertion_message_expr (domain=0x7f070a8fd301 "GLib-GIO", file=0x7f070a91ca58 "/build/buildd/glib2.0-2.28.6/./gio/gdbusmessage.c", line=1958, func=0x7f070a91d9e0 "append_value_to_blob", expr=<optimized out>) at /build/buildd/glib2.0-2.28.6/./glib/gtestutils.c:1369
 append_value_to_blob (value=<optimized out>, type=0x7f070ae2d722, mos=0x2323180, dos=0x7f06f8084cc0, out_padding_added=0x0, error=0x0) at /build/buildd/glib2.0-2.28.6/./gio/gdbusmessage.c:1958
 append_value_to_blob (value=<optimized out>, type=<optimized out>, mos=0x2323180, dos=0x7f06f8084cc0, out_padding_added=0x0, error=0x0) at /build/buildd/glib2.0-2.28.6/./gio/gdbusmessage.c:2116
 append_value_to_blob (value=<optimized out>, type=<optimized out>, mos=0x2323180, dos=0x7f06f8084cc0, out_padding_added=0x7fff5715fc88, error=0x0) at /build/buildd/glib2.0-2.28.6/./gio/gdbusmessage.c:2091