TinyButStrong Error when merging block "cate_show": unsupported variable type : 'NULL'.

TinyButStrong Error when merging block [relate_post_sql]: MySQLi error message when opening the query: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 ') ) A JOIN wp_posts B ON A.object_id = B.ID ORDER BY RAND() limit 0,15' at line 1
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