Для устранения ошибки
[Error] [] operator not supported for strings (0) /home/bitrix/www/bitrix/modules/iblock/classes/general/iblockproperty.php:34 #0: CAllIBlockProperty::GetList(array, array) /home/bitrix/www/bitrix/modules/iblock/classes/general/iblockelement.php:2854 #1: CAllIBlockElement->PrepareGetList(array, array, array, string, array, array, NULL, NULL, NULL, boolean, string, array, array, array) /home/bitrix/www/bitrix/modules/iblock/classes/mysql/iblockelement.php:339 #2: CIBlockElement->prepareSql(array, array, boolean, array) /home/bitrix/www/bitrix/modules/iblock/classes/mysql/iblockelement.php:641 #3: CIBlockElement::GetList(array, array, boolean, array, array) /home/bitrix/www/bitrix/components/bitrix/news.list/component.php:250 #4: include(string) /home/bitrix/www/bitrix/modules/main/classes/general/component.php:548 #5: CBitrixComponent->__includeComponent() /home/bitrix/www/bitrix/modules/main/classes/general/component.php:600 #6: CBitrixComponent->includeComponent(string, array, NULL) /home/bitrix/www/bitrix/modules/main/classes/general/main.php:1035 #7: CAllMain->IncludeComponent(string, string, array) /home/bitrix/www/index.php:12
Необходимо в файле /home/bitrix/www/bitrix/modules/iblock/classes/general/iblockproperty.php меняем строку $arSqlSearch ="" на $arSqlSearch = [];