Vnitřní chyba serveru

SQLSTATE[HY000]: General error: 1271 Illegal mix of collations for operation 'concat' --- query was: SELECT nadpis as name, concat('/oznameni/',id,'-',idascii) as url, termin as jd_ny FROM oznameni WHERE status='open' AND termin>2459341 ORDER BY termin LIMIT 7

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