Database error - cant find table if PREFIX

The referred installation uses a PREFIX like "myPREFIX_" ...

PDOException:

SQLSTATE[42S02]:
Base table or view not found:
1051 Unknown table 'flag_content':
SELECT flag_content.*, node.title FROM {flag_content}, {flags}, {node} WHERE flags.fid = flag_content.fid AND flags.name = :name AND node.nid = flag_content.content_id AND flag_content.content_type = 'node'; Array ( [:name] => bookmarks ) in bookmarkorganizer_generate_bookmarks()
(line 1091 of /home/.../all/modules/bookmarkorganizer/bookmarkorganizer.inc).