NAV 2009 Crashes while trying to export the Blob Field

Hi Experts,

we are trying to export the table data using xmlport port.

In the table we have Blob Field, we are using Customer.CALCFIELDS("NEW BLOB Field"); . The moment Cursor reaches this code, NAV Crashes and error comes as shown below (attached image).

NAV VERSION is 'NL Dynamics NAV 6.0 R2'
2009 Build - '32012'
DB is SQL DB.

please give your suggestions.