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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 COUNT(*) as num FROM tblproducts a LEFT JOIN tblcategories b ON(a.category_id=b.c_id) WHERE a.category_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 = [
    'slug' => '134',
];