CÓDIGO DE ERROR: 500

object(PDOException)
Data
[*message]: string(205) "SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ')' at line 1"
[Exceptionstring]: string(0) ""
[*code]: string(5) "42000"
[*file]: string(77) "/usr/home/nikisgalicia/www/includes/classes/controllers/productController.php"
[*line]: int 28
[Exceptiontrace]: array(4)
[0]: array(6)
[file]: string(77) "/usr/home/nikisgalicia/www/includes/classes/controllers/productController.php"
[line]: int 28
[function]: string(5) "query"
[class]: string(3) "PDO"
[type]: string(2) "->"
[args]: array(1)
[0]: string(83) "SELECT id FROM products WHERE groupref IN (SELECT groupref FROM products WHERE id=)"
[1]: array(6)
[file]: string(77) "/usr/home/nikisgalicia/www/includes/classes/controllers/productController.php"
[line]: int 4
[function]: string(10) "displayIni"
[class]: string(17) "ProductController"
[type]: string(2) "->"
[args]: array(0)
[2]: array(6)
[file]: string(70) "/usr/home/nikisgalicia/www/includes/classes/controllers/Controller.php"
[line]: int 112
[function]: string(7) "routing"
[class]: string(17) "ProductController"
[type]: string(2) "->"
[args]: array(0)
[3]: array(6)
[file]: string(36) "/usr/home/nikisgalicia/www/index.php"
[line]: int 11
[function]: string(11) "__construct"
[class]: string(10) "Controller"
[type]: string(2) "->"
[args]: array(1)
[0]: object(Pimple)
[Exceptionprevious]: null 
[errorInfo]: array(3)
[0]: string(5) "42000"
[1]: int 1064
[2]: string(149) "You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ')' at line 1"
Class info
Filename: built-in
Interfaces: Throwable
Parent: RuntimeException
Public properties
[errorInfo]: array(3)
[0]: string(5) "42000"
[1]: int 1064
[2]: string(149) "You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ')' at line 1"
Methods
private __clone()
public __construct([$message], [$code], [$previous])
public __toString()
public __wakeup()
public getCode()
public getFile()
public getLine()
public getMessage()
public getPrevious()
public getTrace()
public getTraceAsString()