\Drupal\commerce_payment\PluginForm\ManualPaymentAddForm->buildConfigurationForm() contains a call to \Drupal\commerce_order\Entity\Order->getBalance(). The return for this function is listed as \Drupal\commerce_price\Price|null, but the code in buildConfigurationForm() assumes that a Price entity has been returned and attempts to call its isPositive() method. This causes a fatal error if getBalance() has returned (a permissible) NULL value.
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Comment #3
mrdalesmith commentedI think the best approach is to throw as exception as we would if the Order itself was missing, as the form itself will serve no purpose without a balance to pay. Created a fork where that happens.
Comment #5
jsacksick commented