Null value exception

[Anonymous]

I am getting following exception at my target component:
Invalid query exception: invalid null value for clustering key part of person_id

All the column that I am passing from source are either having a value or they are 0, none of them is null

[Jesperrekuh]

Post a screendump of your job please and highlight the component which raises the error ?
And the query (screendumo) you're running... provide us with log-details please?!?!?!