Errors in logs when changing Epic Links if Epic is not mapped as Requirement

Here's the stack trace:

2018-10-31 16:33:37,941 http-nio-8080-exec-21 ERROR andicks 993x18353x1 1hrgsac 10.228.226.37,0:0:0:0:0:0:0:1 /secure/AjaxIssueAction.jspa [c.a.event.internal.AsynchronousAbleEventDispatcher] There was an exception thrown trying to dispatch event [com.xpandit.raven.event.EpicLinkChangeEvent@fe39771f] from the invoker [SingleParameterMethodListenerInvoker

{method=public void com.xpandit.raven.customfield.listener.EpicLinkChangeListener.a(com.xpandit.raven.event.EpicLinkChangeEvent), listener=com.xpandit.raven.customfield.listener.EpicLinkChangeListener@2a0d17a7}

]
java.lang.RuntimeException: Issue 'LINEARREQS-4' is not a requirement issue!. Listener: com.xpandit.raven.customfield.listener.EpicLinkChangeListener event: com.xpandit.raven.event.EpicLinkChangeEvent
at com.atlassian.event.internal.SingleParameterMethodListenerInvoker.invoke(SingleParameterMethodListenerInvoker.java:55)
at com.atlassian.event.internal.AsynchronousAbleEventDispatcher$1$1.run(AsynchronousAbleEventDispatcher.java:38)
at com.google.common.util.concurrent.MoreExecutors$DirectExecutorService.execute(MoreExecutors.java:299)
at com.atlassian.event.internal.AsynchronousAbleEventDispatcher.dispatch(AsynchronousAbleEventDispatcher.java:88)
at com.atlassian.event.internal.EventPublisherImpl.invokeListeners(EventPublisherImpl.java:204)
at com.atlassian.event.internal.EventPublisherImpl.publish(EventPublisherImpl.java:115)
... 2 filtered
at java.lang.reflect.Method.invoke(Method.java:498)
at com.atlassian.plugin.util.ContextClassLoaderSettingInvocationHandler.invoke(ContextClassLoaderSettingInvocationHandler.java:26)
at com.sun.proxy.$Proxy121.publish(Unknown Source)
... 2 filtered
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:302)
at org.eclipse.gemini.blueprint.service.importer.support.internal.aop.ServiceInvoker.doInvoke(ServiceInvoker.java:56)
at org.eclipse.gemini.blueprint.service.importer.support.internal.aop.ServiceInvoker.invoke(ServiceInvoker.java:60)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:133)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:121)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.eclipse.gemini.blueprint.service.util.internal.aop.ServiceTCCLInterceptor.invokeUnprivileged(ServiceTCCLInterceptor.java:70)
at org.eclipse.gemini.blueprint.service.util.internal.aop.ServiceTCCLInterceptor.invoke(ServiceTCCLInterceptor.java:53)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.eclipse.gemini.blueprint.service.importer.support.LocalBundleContextAdvice.invoke(LocalBundleContextAdvice.java:57)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:133)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:121)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208)
at com.sun.proxy.$Proxy2372.publish(Unknown Source)
at com.xpandit.raven.servlet.filter.IssueLinksInterceptor.doHttpFilter(Unknown Source)
at com.xpandit.raven.servlet.filter.AbstractServletFilter.doFilter(Unknown Source)
... 14 filtered
at com.atlassian.jira.security.JiraSecurityFilter.lambda$doFilter$0(JiraSecurityFilter.java:66)
... 1 filtered
at com.atlassian.jira.security.JiraSecurityFilter.doFilter(JiraSecurityFilter.java:64)
... 39 filtered
at com.atlassian.jira.servermetrics.CorrelationIdPopulatorFilter.doFilter(CorrelationIdPopulatorFilter.java:30)
... 5 filtered
at com.atlassian.web.servlet.plugin.request.RedirectInterceptingFilter.doFilter(RedirectInterceptingFilter.java:21)
... 4 filtered
at com.atlassian.web.servlet.plugin.LocationCleanerFilter.doFilter(LocationCleanerFilter.java:36)
... 26 filtered
at com.atlassian.jira.servermetrics.MetricsCollectorFilter.doFilter(MetricsCollectorFilter.java:25)
... 23 filtered
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalArgumentException: Issue 'LINEARREQS-4' is not a requirement issue!
at com.xpandit.raven.service.impl.RequirementServiceImpl.a(Unknown Source)
at com.xpandit.raven.service.impl.RequirementServiceImpl.getRequirementTests(Unknown Source)
at com.xpandit.raven.service.impl.RequirementServiceImpl.a(Unknown Source)
at com.xpandit.raven.service.impl.RequirementServiceImpl.getAllRequirementTests(Unknown Source)
at com.xpandit.raven.requirement.ScopesServiceImpl.b(Unknown Source)
at com.xpandit.raven.requirement.RequirementStatusManagerImpl.a(Unknown Source)
at com.xpandit.raven.customfield.listener.EpicLinkChangeListener.a(Unknown Source)
... 2 filtered
at java.lang.reflect.Method.invoke(Method.java:498)
at com.atlassian.event.internal.SingleParameterMethodListenerInvoker.invoke(SingleParameterMethodListenerInvoker.java:40)
... 154 more