Some kind of Sql errors

Hi there can someone explain what does mean this :

• XF\Db\InvalidQueryException: MySQL query error [1064]: syntax error, unexpected '+', expecting FTS_TERM or FTS_NUMB or '*'
• src/XF/Db/AbstractStatement.php:230

• ed '+', expecting FTS_TERM or FTS_NUMB or '*'
• src/XF/Db/AbstractStatement.php:230
• Generated by:  xxxx
• Feb 24, 2024 at 08:54

Stack trace​

SELECT search_index.content_type, search_index.content_id
FROM xf_search_index AS...

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