transaction return internal error

Here's the error in ejabberd.log

=ERROR REPORT==== 2013-09-29 21:09:12 ===
E(<0.6309.0>:mod_pubsub:3866) : transaction return internal error: {'EXIT',
{aborted,
{badarg,
[pubsub_item,
173,
3]}}}

Here's what I have in pubsub mod

{mod_pubsub, [
{access_createnode, pubsub_createnode},
{ignore_pep_from_offline, true}, % reduces resource comsumption, but XEP incompliant
%%{ignore_pep_from_offline, false}, % XEP compliant, but increases resource comsumption
{last_item_cache, false},
{plugins, ["flat", "hometree", "pep"]} % pep requires mod_caps
]},

I am getting this error for the past few months.

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