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Database Exceptionyii\db\Exception

SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1
The SQL being executed was: SELECT `cat_id` FROM `szy_article_cat` WHERE parent_id=

Error Info: Array
(
    [0] => 42000
    [1] => 1064
    [2] => You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1
)
$_GET = [
    'cat_id' => '420',
];

$_SESSION = [
    '__flash' => [],
    '__context__' => unserialize('O:23:"service\\context\\Context":2:{s:31:"' . "\0" . 'service\\context\\Context' . "\0" . 'app_id";s:8:"app-help";s:33:"' . "\0" . 'service\\context\\Context' . "\0" . 'last_url";N;}'),
];