zidestore error on contacts sync

Anyone know why I might be getting this error

 

Aug 13 21:58:09 ogo-zidestore-1.5 [2521]: <0x0x97f04cc[SxPerson]> ERROR:
failed to write vCard: (Exception name:InvalidArgumentException
class:InvalidArgumentException reason:nil object to be added in dictionary
(key=email2) info:<nil>)

 

This is when attempting to sync through funambol/Groupdav connector.

It seems as if there are a lot of nil objects in the vCard but email2 throws
an error?

Or is it because the vCard doesn't specify email2 - instead it specifies

EMAIL;INTERNET:

EMAIL;INTERNET;HOME:

EMAIL;INTERNET;WORK:

 

Peter