Fatal error: Uncaught Symfony\Component\Cache\Exception\InvalidArgumentException: Cache key must be string, "NULL" given. in /opt/polirom.ro/vendor/symfony/symfony/src/Symfony/Component/Cache/CacheItem.php:161 Stack trace: #0 /opt/polirom.ro/vendor/symfony/symfony/src/Symfony/Component/Cache/Traits/AbstractTrait.php(235): Symfony\Component\Cache\CacheItem::validateKey() #1 /opt/polirom.ro/vendor/symfony/symfony/src/Symfony/Component/Cache/Adapter/AbstractAdapter.php(154): Symfony\Component\Cache\Adapter\AbstractAdapter->getId() #2 /opt/polirom.ro/src/Core/Localization/CLDR/DataLayer/LocaleCache.php(82): Symfony\Component\Cache\Adapter\AbstractAdapter->getItem() #3 /opt/polirom.ro/src/Core/Data/Layer/AbstractDataLayer.php(91): PrestaShop\PrestaShop\Core\Localization\CLDR\DataLayer\LocaleCache->doRead() #4 /opt/polirom.ro/src/Core/Localization/CLDR/LocaleDataSource.php(62): PrestaShop\PrestaShop\Core\Data\Layer\AbstractDataLayer->read() #5 /opt/polirom.ro/src/Core/Localization/CLDR/LocaleRepository.php(58): PrestaShop\Prest in /opt/polirom.ro/vendor/symfony/symfony/src/Symfony/Component/Cache/CacheItem.php on line 161