MySQL error in file: /engine/modules/show.full.php at line 1069

Error Number: 3685

The Error returned was:
Illegal argument to a regular expression.

SQL query:

SELECT title_fr, short_story_fr, id, date, short_story, xfields, title, category, alt_name FROM dle_post WHERE ( (title_fr <> '' AND short_story_fr <> '' AND title_fr <> '' AND short_story_fr <> '') OR ( xfields LIKE '%hide_for_language|No%' ) ) AND category regexp '[[:<:]](56)[[:>:]]' AND MATCH (title, short_story, full_story, xfields) AGAINST ('Tolkanka Tolkanka — Papier hygiénique.') AND id != 5241 AND approve=1 LIMIT 5