[TypeError] 
Return value of Product::getProductIdByCode() must be of the type string, null returned (0)
/var/www/mi-shop/local/php_interface/include/helpers/Product.php:648
#0: Product->getProductIdByCode(string)
	/var/www/mi-shop/local/components/mi/el.catalog.element/component.php:32
#1: include(string)
	/var/www/mi-shop/bitrix/modules/main/classes/general/component.php:594
#2: CBitrixComponent->__includeComponent()
	/var/www/mi-shop/bitrix/modules/main/classes/general/component.php:653
#3: CBitrixComponent->includeComponent(string, array, object)
	/var/www/mi-shop/bitrix/modules/main/classes/general/main.php:1038
#4: CAllMain->IncludeComponent(string, string, array, object)
	/var/www/mi-shop/local/components/mi/catalog/templates/.default/element.php:21
#5: include(string)
	/var/www/mi-shop/bitrix/modules/main/classes/general/component_template.php:720
#6: CBitrixComponentTemplate->__IncludePHPTemplate(array, array, string)
	/var/www/mi-shop/bitrix/modules/main/classes/general/component_template.php:815
#7: CBitrixComponentTemplate->IncludeTemplate(array)
	/var/www/mi-shop/bitrix/modules/main/classes/general/component.php:735
#8: CBitrixComponent->showComponentTemplate()
	/var/www/mi-shop/bitrix/modules/main/classes/general/component.php:683
#9: CBitrixComponent->includeComponentTemplate(string)
	/var/www/mi-shop/local/components/mi/catalog/component.php:282
#10: include(string)
	/var/www/mi-shop/bitrix/modules/main/classes/general/component.php:594
#11: CBitrixComponent->__includeComponent()
	/var/www/mi-shop/bitrix/modules/main/classes/general/component.php:653
#12: CBitrixComponent->includeComponent(string, array, NULL)
	/var/www/mi-shop/bitrix/modules/main/classes/general/main.php:1038
#13: CAllMain->IncludeComponent(string, string, array)
	/var/www/mi-shop/ru/catalog/index.php:27
#14: include_once(string)
	/var/www/mi-shop/bitrix/modules/main/include/urlrewrite.php:159
#15: include_once(string)
	/var/www/mi-shop/bitrix/urlrewrite.php:2