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java.lang.NullPointerException: null	at org.killbill.billing.subscription.api.user.DefaultSubscriptionBase.getLastActiveProduct(DefaultSubscriptionBase.java:276)	at org.killbill.billing.entitlement.engine.core.EventsStreamBuilder.createPlanPhaseSpecifier(EventsStreamBuilder.java:372)	at org.killbill.billing.entitlement.engine.core.EventsStreamBuilder.buildForEntitlement(EventsStreamBuilder.java:336)	at org.killbill.billing.entitlement.engine.core.EventsStreamBuilder.buildForAccount(EventsStreamBuilder.java:220)	at org.killbill.billing.entitlement.engine.core.EventsStreamBuilder.buildForAccount(EventsStreamBuilder.java:127)	at org.killbill.billing.entitlement.api.svcs.DefaultEntitlementApiBase.getAllEntitlementsForAccount(DefaultEntitlementApiBase.java:113)	at org.killbill.billing.entitlement.api.DefaultSubscriptionApi.getSubscriptionForEntitlementId(DefaultSubscriptionApi.java:136)