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java.lang.NullPointerException at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:180) at com.atlassian.jira.notification.NotificationRecipient.<init>(NotificationRecipient.java:36) at com.atlassian.jira.notification.type.UserToRecipient.apply(UserToRecipient.java:21) at com.atlassian.jira.notification.type.UserToRecipient.apply(UserToRecipient.java:14) at com.google.common.collect.Lists$TransformingRandomAccessList.get(Lists.java:431) at java.util.AbstractList$Itr.next(AbstractList.java:345) at java.util.AbstractCollection.addAll(AbstractCollection.java:305) at com.atlassian.jira.notification.DefaultNotificationSchemeManager.getRecipients(DefaultNotificationSchemeManager.java:279) at com.atlassian.jira.event.listeners.mail.MailListener.createMailItems(MailListener.java:122) at com.atlassian.jira.event.listeners.mail.MailListener.sendNotification(MailListener.java:87) at com.atlassian.jira.event.listeners.mail.MailListener.issueCommented(MailListener.java:188) at com.atlassian.jira.event.issue.AbstractIssueEventListener.workflowEvent(AbstractIssueEventListener.java:106) at com.atlassian.jira.event.issue.IssueEventListenerHandler$IssueEventInvoker.invoke(IssueEventListenerHandler.java:49) at com.atlassian.event.internal.AsynchronousAbleEventDispatcher$2.run(AsynchronousAbleEventDispatcher.java:60) at com.atlassian.event.internal.AsynchronousAbleEventDispatcher$1.execute(AsynchronousAbleEventDispatcher.java:28) at com.atlassian.event.internal.AsynchronousAbleEventDispatcher.dispatch(AsynchronousAbleEventDispatcher.java:56) at com.atlassian.event.internal.EventPublisherImpl.invokeListeners(EventPublisherImpl.java:151) at com.atlassian.event.internal.EventPublisherImpl.publish(EventPublisherImpl.java:70) at sun.reflect.GeneratedMethodAccessor43.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.atlassian.multitenant.impl.MultiTenantComponentFactoryImpl$AbstractMultiTenantAwareInvocationHandler.invokeInternal(MultiTenantComponentFactoryImpl.java:181) at com.atlassian.multitenant.impl.MultiTenantComponentFactoryImpl$MultiTenantAwareInvocationHandler.invoke(MultiTenantComponentFactoryImpl.java:211) at $Proxy5.publish(Unknown Source) at com.atlassian.multitenant.event.DefaultPeeringEventPublisherManager.publish(DefaultPeeringEventPublisherManager.java:17) at com.atlassian.multitenant.event.PeeringEventPublisher.publish(PeeringEventPublisher.java:23) at com.atlassian.jira.event.issue.IssueEventDispatcher.dispatchEvent(IssueEventDispatcher.java:254) at com.atlassian.jira.event.issue.IssueEventDispatcher.dispatchEvent(IssueEventDispatcher.java:176) at com.atlassian.jira.web.action.issue.AddComment.alertSystemOfComment(AddComment.java:144) at com.atlassian.jira.web.action.issue.AddComment.doExecute(AddComment.java:109) at webwork.action.ActionSupport.execute(ActionSupport.java:165) at com.atlassian.jira.action.JiraActionSupport.execute(JiraActionSupport.java:76) at webwork.interceptor.DefaultInterceptorChain.proceed(DefaultInterceptorChain.java:39) at webwork.interceptor.NestedInterceptorChain.proceed(NestedInterceptorChain.java:31) at webwork.interceptor.ChainedInterceptor.intercept(ChainedInterceptor.java:16) at webwork.interceptor.DefaultInterceptorChain.proceed(DefaultInterceptorChain.java:35) at webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:205) at webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:143) at com.atlassian.jira.web.dispatcher.JiraWebworkActionDispatcher.service(JiraWebworkActionDispatcher.java:152) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)