Block: sort by Year Published - SQL query error

after updating from 1.6 to 1.7, the block gives a SQL error when sorted on Year Published:
user warning: Unknown column 'b.biblio_year' in 'order clause' query: SELECT n.nid, n.title FROM drupal_node n WHERE n.type = 'biblio' AND n.status=1 ORDER BY b.biblio_year DESC LIMIT 0, 2

Sorting on Data Created does not result in an error.