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Nnsql: There's an issue with your query:
SELECT distinct tags_name, tags_description \
FROM products_tags JOIN categories_tags USING (tags_name) JOIN products_tags_description USING (tags_name) \
WHERE categories_id = 5520 AND show_in_tags_search = 1 AND products_id IN () \
ORDER BY products_tags_description.sort_order

Mysql said: 1064:You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ') ORDER BY products_tags_description.sort_order' at line 1

Call-stack printout:
/var/www/repoupdater_updated_prodcheckout/libs/nnsql/Nnsql.php:320: in function qry
/var/www/repoupdater_updated_prodcheckout/libs/tagsutils/Tagsutils.php:1014: in function as_array
/var/www/repoupdater_updated_prodcheckout/libs/tagsutils/Tagsutils.php:720: in function get_bootstrap_search_form
/var/www/repoupdater_updated_prodcheckout/frontend/index.php:70: in function get_bootstrap_search_form_for_category
/var/www/repoupdater_updated_prodcheckout/frontend/index.php:429: in function get_heading