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java.lang.NullPointerException: 	at com.atlassian.jira.mention.MentionServiceImpl.sendCommentMentions(MentionServiceImpl.java:53)	at com.atlassian.jira.event.listeners.mention.MentionEventListener.onIssueEvent(MentionEventListener.java:48)	at sun.reflect.GeneratedMethodAccessor809.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at com.atlassian.event.internal.SingleParameterMethodListenerInvoker.invoke(SingleParameterMethodListenerInvoker.java:36)	at com.atlassian.event.internal.AsynchronousAbleEventDispatcher$2.run(AsynchronousAbleEventDispatcher.java:60)	at com.atlassian.event.internal.AsynchronousAbleEventDispatcher$1.execute(AsynchronousAbleEventDispatcher.java:28)	at com.atlassian.event.internal.AsynchronousAbleEventDispatcher.dispatch(AsynchronousAbleEventDispatcher.java:56)	at com.atlassian.event.internal.EventPublisherImpl.invokeListeners(EventPublisherImpl.java:151)	at com.atlassian.event.internal.EventPublisherImpl.publish(EventPublisherImpl.java:70)	at sun.reflect.GeneratedMethodAccessor40.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at com.atlassian.multitenant.impl.MultiTenantComponentFactoryImpl$AbstractMultiTenantAwareInvocationHandler.invokeInternal(MultiTenantComponentFactoryImpl.java:181)	at com.atlassian.multitenant.impl.MultiTenantComponentFactoryImpl$MultiTenantAwareInvocationHandler.invoke(MultiTenantComponentFactoryImpl.java:211)	at $Proxy10.publish(Unknown Source)	at com.atlassian.multitenant.event.DefaultPeeringEventPublisherManager.publish(DefaultPeeringEventPublisherManager.java:17)	at com.atlassian.multitenant.event.PeeringEventPublisher.publish(PeeringEventPublisher.java:23)	at com.atlassian.jira.event.issue.IssueEventDispatcher.dispatchEvent(IssueEventDispatcher.java:184)	at com.atlassian.jira.event.issue.IssueEventDispatcher.dispatchEvent(IssueEventDispatcher.java:134)	at com.atlassian.jira.workflow.function.event.FireIssueEventFunction.execute(FireIssueEventFunction.java:57)	at com.opensymphony.workflow.AbstractWorkflow.executeFunction(AbstractWorkflow.java:1050)	at com.opensymphony.workflow.AbstractWorkflow.transitionWorkflow(AbstractWorkflow.java:1446)	at com.opensymphony.workflow.AbstractWorkflow.doAction(AbstractWorkflow.java:564)	at com.atlassian.jira.workflow.OSWorkflowManager.doWorkflowActionInsideTxn(OSWorkflowManager.java:894)	at com.atlassian.jira.workflow.OSWorkflowManager.doWorkflowAction(OSWorkflowManager.java:850)	at com.atlassian.jira.workflow.WorkflowTransitionUtilImpl.progress(WorkflowTransitionUtilImpl.java:270)	at com.atlassian.jira.toolkit.listener.AutoTransitionListener.workflowEvent(AutoTransitionListener.java:145)	at com.atlassian.jira.event.issue.IssueEventListenerHandler$IssueEventInvoker.invoke(IssueEventListenerHandler.java:49)	at com.atlassian.event.internal.AsynchronousAbleEventDispatcher$2.run(AsynchronousAbleEventDispatcher.java:60)	at com.atlassian.event.internal.AsynchronousAbleEventDispatcher$1.execute(AsynchronousAbleEventDispatcher.java:28)	at com.atlassian.event.internal.AsynchronousAbleEventDispatcher.dispatch(AsynchronousAbleEventDispatcher.java:56)	at com.atlassian.event.internal.EventPublisherImpl.invokeListeners(EventPublisherImpl.java:151)	at com.atlassian.event.internal.EventPublisherImpl.publish(EventPublisherImpl.java:70)	at sun.reflect.GeneratedMethodAccessor40.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at com.atlassian.multitenant.impl.MultiTenantComponentFactoryImpl$AbstractMultiTenantAwareInvocationHandler.invokeInternal(MultiTenantComponentFactoryImpl.java:181)	at com.atlassian.multitenant.impl.MultiTenantComponentFactoryImpl$MultiTenantAwareInvocationHandler.invoke(MultiTenantComponentFactoryImpl.java:211)	at $Proxy10.publish(Unknown Source)	at com.atlassian.multitenant.event.DefaultPeeringEventPublisherManager.publish(DefaultPeeringEventPublisherManager.java:17)	at com.atlassian.multitenant.event.PeeringEventPublisher.publish(PeeringEventPublisher.java:23)	at com.atlassian.jira.event.issue.IssueEventDispatcher.dispatchEvent(IssueEventDispatcher.java:184)	at com.atlassian.jira.event.issue.IssueEventDispatcher.dispatchEvent(IssueEventDispatcher.java:122)	at com.atlassian.jira.issue.comments.DefaultCommentManager.dispatchEvent(DefaultCommentManager.java:352)	at com.atlassian.jira.issue.comments.DefaultCommentManager.create(DefaultCommentManager.java:216)	at com.atlassian.jira.issue.comments.DefaultCommentManager.create(DefaultCommentManager.java:166)	at com.atlassian.jira.issue.comments.DefaultCommentManager.create(DefaultCommentManager.java:160)	at com.atlassian.jira.issue.comments.DefaultCommentManager.create(DefaultCommentManager.java:154)	at sun.reflect.GeneratedMethodAccessor799.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at com.atlassian.multitenant.impl.MultiTenantComponentFactoryImpl$AbstractMultiTenantAwareInvocationHandler.invokeInternal(MultiTenantComponentFactoryImpl.java:181)	at com.atlassian.multitenant.impl.MultiTenantComponentFactoryImpl$MultiTenantAwareInvocationHandler.invoke(MultiTenantComponentFactoryImpl.java:211)	at $Proxy144.create(Unknown Source)	at sun.reflect.GeneratedMethodAccessor799.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at com.atlassian.plugin.osgi.hostcomponents.impl.DefaultComponentRegistrar$ContextClassLoaderSettingInvocationHandler.invoke(DefaultComponentRegistrar.java:129)	at $Proxy144.create(Unknown Source)	at sun.reflect.GeneratedMethodAccessor799.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at com.atlassian.plugin.osgi.bridge.external.HostComponentFactoryBean$DynamicServiceInvocationHandler.invoke(HostComponentFactoryBean.java:154)	at $Proxy144.create(Unknown Source)	at com.atlassian.support.mail.handlers.CreateCommentOrProxyHandler.addComment(CreateCommentOrProxyHandler.java:276)	at com.atlassian.support.mail.handlers.CreateCommentOrProxyHandler.addComment(CreateCommentOrProxyHandler.java:267)	at com.atlassian.support.mail.handlers.CreateCommentOrProxyHandler.addCommentAndAttachments(CreateCommentOrProxyHandler.java:136)	at com.atlassian.support.mail.handlers.CreateCommentOrProxyHandler.handleMessage(CreateCommentOrProxyHandler.java:96)	at com.atlassian.jira.service.services.mail.MailFetcherService$1.process(MailFetcherService.java:361)	at com.atlassian.jira.service.services.mail.MailFetcherService$MessageProviderImpl.getAndProcessMail(MailFetcherService.java:264)	at com.atlassian.jira.service.services.mail.MailFetcherService.runImpl(MailFetcherService.java:349)	at com.atlassian.jira.service.services.file.AbstractMessageHandlingService.run(AbstractMessageHandlingService.java:250)	at com.atlassian.jira.service.JiraServiceContainerImpl.run(JiraServiceContainerImpl.java:61)	at com.atlassian.jira.service.ServiceRunner.execute(ServiceRunner.java:47)	at org.quartz.core.JobRunShell.run(JobRunShell.java:195)	at com.atlassian.multitenant.quartz.MultiTenantThreadPool$MultiTenantRunnable.run(MultiTenantThreadPool.java:72)	at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:520)