Failed to add payment method for account 7df5b5fd-8d1f-412d-83ff-ca9db3181d10 : undefined method `[]' for nil:NilClass

Stack trace

org.killbill.billing.payment.api.PaymentApiException: Failed to add payment method for account 7df5b5fd-8d1f-412d-83ff-ca9db3181d10 : undefined method `[]' for nil:NilClass
	at org.killbill.billing.payment.core.PaymentMethodProcessor$1.doOperation(PaymentMethodProcessor.java:126)
	at org.killbill.billing.payment.core.PaymentMethodProcessor$1.doOperation(PaymentMethodProcessor.java:107)
	at org.killbill.billing.payment.core.ProcessorBase$WithAccountLock.processAccountWithLock(ProcessorBase.java:219)
	at org.killbill.billing.payment.core.ProcessorBase$CallableWithAccountLock.call(ProcessorBase.java:208)
	at org.killbill.billing.payment.core.ProcessorBase$CallableWithAccountLock.call(ProcessorBase.java:192)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)