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Fatal error: Uncaught InvalidArgumentException: non-nullable order_amount cannot be null in /homepages/13/d499994003/htdocs/clickandbuilds/Fanpiece/php-klarna-payments/src/Model/SessionCreate.php:1069 Stack trace: #0 /homepages/13/d499994003/htdocs/clickandbuilds/Fanpiece/checkout.php(44): Klarna\Payments\Model\SessionCreate->setOrderAmount() #1 {main} thrown in /homepages/13/d499994003/htdocs/clickandbuilds/Fanpiece/php-klarna-payments/src/Model/SessionCreate.php on line 1069