riak crash when parsing Ratio's encoded by c.c.json

riak crash

==> log/sasl-error.log <==

=CRASH REPORT==== 4-Jan-2011::21:03:53 ===
  crasher:
    initial call: luke_phase:init/1
    pid: <0.5305.13>
    registered_name: []
    exception exit: {error,[{<<"lineno">>,483},
                            {<<"message">>,<<"JSON.parse">>},
                            {<<"source">>,<<"unknown">>}]}
      in function  gen_fsm:terminate/7
    ancestors: [luke_phase_sup,luke_sup,<0.84.0>]
    messages: []
    links: [<0.5304.13>,<0.87.0>]
    dictionary: []
    trap_exit: false
    status: running
    heap_size: 610
    stack_size: 24
    reductions: 228
  neighbours:

=SUPERVISOR REPORT==== 4-Jan-2011::21:03:53 ===
     Supervisor: {local,luke_phase_sup}
     Context:    child_terminated
     Reason:     {error,[{<<"lineno">>,483},
                         {<<"message">>,<<"JSON.parse">>},
                         {<<"source">>,<<"unknown">>}]}
     Offender:   [{pid,<0.5305.13>},
                  {name,undefined},
                  {mfargs,
                      {luke_phase,start_link,
                          [riak_kv_map_phase,0,
                           [accumulate],
                           undefined,<0.5304.13>,66000,
                           [{javascript,
                                {map,
                                    {jsfun,<<"Riak.mapValuesJson">>},
                                    none,true}}]]}},
                  {restart_type,temporary},
                  {shutdown,brutal_kill},
                  {child_type,worker}]