Strange error serialising

I have many entries from one couch database that are not getting indexed,
and the error is quite cryptic:

[0]: index [wk-wazoku-wazoku-com], type [wk-wazoku-wazoku-com], id
[d400f7af5a9b443ba368076b2c07112d], message [MapperParsingException[object
mapping [pivotal] trying to serialize a value with no field associated with
it, current value [pt_40999433]]]

Any idea of what that actually means?
Looking at the doc there is nothing strange about that, just a simple key
and value..

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