PDOException 21000

SQLSTATE[21000]: Cardinality violation: 1242 Subquery returns more than 1 row

Source file

File: \/data/www/lumegg_de/www/classes/app/DBConnection.php:33
23: 
        parent::query('SET CHARACTER SET '.$config->getDatabaseCharset().'; SET NAMES '.$config->getDatabaseCharset());
24: 
        $this->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
25: 
        $this->setAttribute(PDO::ATTR_STATEMENT_CLASS, array('MyPDOStatement', array($this)));
26: 
27: 
    }
28: 
29: 
    public function query($query) {
30: 
        ++$this->queryCount;
31: 
32: 
        $time = microtime(true);
33: 
        $return = parent::query($query);
34: 
        $this->executionTime += (microtime(true) - $time);
35: 
        return $return;
36: 
    }
37: 
38: 
    public function exec($statement) {

Call stack

\/data/www/lumegg_de/www/classes/app/DBConnection.php:33 PDO -> query
\/data/www/lumegg_de/www/modules/products/classes/ProductParameterValue.php:136 DBConnection -> query
\: ProductParameterValue :: findByIDs
\/data/www/lumegg_de/www/classes/app/ProductooRepository.php:39 call_user_func_array
\/data/www/lumegg_de/www/classes/app/DAO.php:66 App\ProductooRepository -> findByIDs
\/data/www/lumegg_de/www/modules/products/classes/CatalogueProduct.php:868 App\DAO -> findByIDs
\/data/www/lumegg_de/www/frontend/templates/basic/actions/catalogue_product_detail.php:31 CatalogueProduct -> getParameters
\/data/www/lumegg_de/www/frontend/templates/basic/index.php:59 include
\/data/www/lumegg_de/www/index.php:247 require_once