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Database Exceptionyii\db\Exception

SQLSTATE[42S22]: Column not found: 1054 Unknown column '' in 'where clause'
The SQL being executed was: SELECT `ad`.* FROM `ad` INNER JOIN `pageType` ON pageType.pageTypeId = ad.pageTypeId WHERE (`ad`.`active`=1) AND (ad.websiteId=2) AND (ad.entityId=522) AND (ad.entityType='fieldofstudy') AND (pageType.pageTypeId=1) AND (((ad.lang='ko') or (ad.lang is null) or (ad.lang = ""))) ORDER BY `ad`.`zoneNumber`

Error Info: Array
(
    [0] => 42S22
    [1] => 1054
    [2] => Unknown column '' in 'where clause'
)
$_GET = [
    'id' => '522',
    'slug' => '항공정비학',
];

$_SESSION = [
    '__flash' => [],
    '_language' => 'ko-KR',
];