ERROR!

Array
(
    [file] => /home/bth055a/domains/addcez.pl/public_html/classes/system/btError.class.php
    [line] => 67
    [function] => generateErrorPage
    [class] => btError
    [type] => ->
    [args] => Array
        (
            [0] => E_ERROR
            [1] => Uncaught TypeError: Argument 1 passed to btMoney::__construct() must be of the type string, null given, called in /home/bth055a/domains/addcez.pl/public_html/classes/system/btProductPrice.class.php on line 103 and defined in /home/bth055a/domains/addcez.pl/public_html/classes/system/btMoney.class.php:84
Stack trace:
#0 /home/bth055a/domains/addcez.pl/public_html/classes/system/btProductPrice.class.php(103): btMoney->__construct(NULL, NULL, 1, 'gross')
#1 /home/bth055a/domains/addcez.pl/public_html/controllers/ProductsController.php(1424): btProductPrice->__construct(false)
#2 /home/bth055a/domains/addcez.pl/public_html/modules/products/products.php(92): ProductsController::getOneFullData('260204')
#3 /home/bth055a/domains/addcez.pl/public_html/modules/products/products.php(67): products->display('260204')
#4 /home/bth055a/domains/addcez.pl/public_html/classes/engine.class.php(316): products->init('display', '260204')
#5 /home/bth055a/domains/addcez.pl/public_html/classes/engine.class.php(169): engine->loadMod
            [2] => /home/bth055a/domains/addcez.pl/public_html/classes/system/btMoney.class.php
            [3] => 84
        )

)