Segmentation fault (core dump) when attempting to do a python query

I've spent a frustrating weekend trying to get a simple python query to
work in both v2.96 (Ubuntu 12.04) and v2.97 (Ubuntu 12.04 + WebUpd8 PPA)

I've also tried reloading 12.04 from scratch, updating and then repeating
the following - but with the same results

Anybody have any ideas on how to debug this further?

From the python interactive console I've typed:

from gi.repository import RB, GLib

db = shell.props.db
query = GLib.PtrArray()

db.query_append_params( query, RB.RhythmDBQueryType.EQUALS,
RB.RhythmDBPropType.ARTIST, 'Culture Club' )

This produces a "segmentation fault (core dump)" error message at the
execution of "db.query_append_params".

There are a few "Culture Club" tracks so I was trying to query for them.

Obviously to complete the query I think I need to

db.do_full_query_parsed(query_model, query)

but I cant get that far...

running rhythmbox --debug I see the following at the point of the
db.query_append_params and segmentation fault.

(21:14:16) [0x9d1baa0] [rhythmdb_read_enter] rhythmdb.c:1229: counter: 1
(21:14:16) [0xabb4750] [query_thread_main] rhythmdb.c:4037: entering
query thread
(21:14:16) [0xabb4750] [rhythmdb_query_internal] rhythmdb.c:4014: doing query
(21:14:16) [0xabb4750] [do_query_recurse] rhythmdb-tree.c:2305: doing
recursive query, 1 conjunctions
(21:14:16) [0xabb4750] [rhythmdb_query_model_add_results]
rhythmdb-query-model.c:2248: adding 145 entries
(21:14:16) [0xabb4750] [rhythmdb_query_internal] rhythmdb.c:4020: completed
(21:14:16) [0x9d1baa0] [rhythmdb_read_enter] rhythmdb.c:1229: counter: 2
(21:14:16) [0xabb4750] [query_thread_main] rhythmdb.c:4037: entering
query thread
(21:14:16) [0xabb4750] [rhythmdb_query_internal] rhythmdb.c:4014: doing query
(21:14:16) [0xabb4750] [do_query_recurse] rhythmdb-tree.c:2305: doing
recursive query, 1 conjunctions
(21:14:16) [0xabb4750] [rhythmdb_query_model_add_results]
rhythmdb-query-model.c:2248: adding 0 entries
(21:14:16) [0xabb4750] [rhythmdb_query_internal] rhythmdb.c:4020: completed
(21:14:16) [0x9d1baa0] [idle_process_update]
rhythmdb-query-model.c:1187: inserting 145 rows
(21:14:16) [0x9d1baa0] [idle_process_update]
rhythmdb-query-model.c:1187: inserting 0 rows
(21:14:16) [0x9d1baa0] [rhythmdb_process_one_event] rhythmdb.c:2537:
processing RHYTHMDB_EVENT_QUERY_COMPLETE
(21:14:16) [0x9d1baa0] [rhythmdb_read_leave] rhythmdb.c:1243: counter: 1
(21:14:16) [0x9d1baa0] [rhythmdb_process_one_event] rhythmdb.c:2530:
processing RHYTHMDB_EVENT_THREAD_EXITED
(21:14:16) [0x9d1baa0] [rhythmdb_process_one_event] rhythmdb.c:2537:
processing RHYTHMDB_EVENT_QUERY_COMPLETE
(21:14:16) [0x9d1baa0] [rhythmdb_read_leave] rhythmdb.c:1243: counter: 0
(21:14:16) [0x9d1baa0] [rhythmdb_process_one_event] rhythmdb.c:2530:
processing RHYTHMDB_EVENT_THREAD_EXITED
Segmentation fault (core dumped)

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