php error happened

Technical information
Error type256
Error descriptionIllegal mix of collations (latin1_swedish_ci,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation '='
URLcaaweb.org/fr/caaliste/resultatshomme_list.php?f=(Competition~equals~21%EF%BF%BD%EF%BF%BDmes%20championnats%20d%27Afrique%20(1-5%20ao%EF%BF%BD%EF%BF%BDt%202018%20Asaba%20au%20Nigeria)%20/%2021st%20AFRICAN%20SENIOR%20ATHLETICS%20CHAMPIONSHIPS%20(1-5%20August%202018%20Asaba%20in%20Nigeria))
Error file/home/caawvgsk/public_html/fr/caaliste/connections/Connection.php
Error line611
SQL queryselect `Discipline` as `_grval_Discipline` from ( SELECT `idResultat`, `Id_Disc_Compet`, `Rang`, `Dossard`, `PrenomNom`, `Pays`, `DateNaiss`, `Competition`, `Discipline`, `Etape`, `Serie`, `Colonne`, `Resultat`, `Qualification` FROM `resultatshomme` WHERE ( ( Competition = '21��mes championnats d\'Afrique (1-5 ao��t 2018 Asaba au Nigeria) / 21st AFRICAN SENIOR ATHLETICS CHAMPIONSHIPS (1-5 August 2018 Asaba in Nigeria)' ) ) ) a where `Discipline` is not NULL and `Discipline` <> '' GROUP BY `Discipline`

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