Si รจ verificato un errore nell'elaborazione

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 'LIMIT 1' at line 6
SELECT * FROM wpa_online_new INNER JOIN wpa_online_2 on idc2=co_tipo2 INNER JOIN wpa_online_1 on idc1=co_tipo INNER JOIN wpa_partner_fad on pf_co=idco and pf_prt=7 WHERE idco= LIMIT 1;