Data too long for column 'field_geolocation_geohash'

hi,

upgrading from 7.x-1.1 failed with the following error code:

Failed: PDOException: SQLSTATE[22001]: String data, right truncated: 1406 Data too long for column 'field_geolocation_geohash' at row 1: UPDATE {field_data_field_geolocation} SET field_geolocation_geohash=:db_update_placeholder_0 WHERE (entity_id = :db_condition_placeholder_0) AND (revision_id = :db_condition_placeholder_1) AND (delta = :db_condition_placeholder_2) ; Array ( [:db_update_placeholder_0] => u26gyc6eeh636r6svxk0 [:db_condition_placeholder_0] => 22 [:db_condition_placeholder_1] => 22 [:db_condition_placeholder_2] => 0 ) in geofield_update_7202() (line 320 of /var/aegir/platforms/drupal-7.17/sites/all/modules/geofield/geofield.install).