Rendering of web-panel fails, version 2.1.0 on JIRA Server 7.11.1, Ubuntu Linux

Hi,
We are trying out your pluggin Issuegraph, version 2.1.0 on JIRA Server 7.11.1, running on Ubuntu 16.04.3 LTS.
When vying an issue, the web-panel for Issuegraph fails to render and this is displayed:
The cause seems to be a null-pointer exception in your plugin:
 /secure/AjaxIssueAction!default.jspa [c.a.j.web.component.ModuleWebComponentImpl] An exception occured while rendering the web panel: de.enisra.jiraplugins.issuegraph:issuegraph (Issuegraph Plugin)
java.lang.NullPointerException
    at de.enisra.jiraplugins.issuegraph.IssueGraph.getContextMap(IssueGraph.java:110)
    at com.atlassian.jira.plugin.webfragment.contextproviders.AbstractJiraContextProvider.getContextMap(AbstractJiraContextProvider.java:28)
    at com.atlassian.plugin.web.descriptors.DefaultWebPanelModuleDescriptor$ContextAwareWebPanel.getHtml(DefaultWebPanelModuleDescriptor.java:144)
    at com.atlassian.jira.web.component.ModuleWebComponentImpl.renderModule(ModuleWebComponentImpl.java:81)
    at com.atlassian.jira.web.component.ModuleWebComponentImpl.access$000(ModuleWebComponentImpl.java:30)
    at com.atlassian.jira.web.component.ModuleWebComponentImpl$1.run(ModuleWebComponentImpl.java:67)
    at com.atlassian.ozymandias.SafePluginPointAccess.runnable(SafePluginPointAccess.java:201)
    at com.atlassian.jira.web.component.ModuleWebComponentImpl.renderModuleAndLetNoThrowablesEscape(ModuleWebComponentImpl.java:63)
    at com.atlassian.jira.web.component.ModuleWebComponentImpl.renderModule(ModuleWebComponentImpl.java:53)
    ... 2 filtered
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.atlassian.plugin.util.ContextClassLoaderSettingInvocationHandler.invoke(ContextClassLoaderSettingInvocationHandler.java:26)
    at com.sun.proxy.$Proxy383.renderModule(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.$Proxy4393.renderModule(Unknown Source)
    at com.atlassian.jira.issue.util.IssueWebPanelRenderUtil.renderHeadlessPanel(IssueWebPanelRenderUtil.java:90)
    at com.atlassian.jira.components.issueviewer.viewissue.webpanel.WebPanelMapperUtilImpl.mapAndRenderPanels(WebPanelMapperUtilImpl.java:113)
    at com.atlassian.jira.components.issueviewer.viewissue.webpanel.WebPanelMapperUtilImpl.create(WebPanelMapperUtilImpl.java:64)
    at com.atlassian.jira.components.issueviewer.action.AjaxIssueAction.populateIssueFields(AjaxIssueAction.java:161)
    at com.atlassian.jira.components.issueviewer.action.AjaxIssueAction.doDefault(AjaxIssueAction.java:134)
    ... 3 filtered
    at java.lang.reflect.Method.invoke(Method.java:498)
    at webwork.util.InjectionUtils$DefaultInjectionImpl.invoke(InjectionUtils.java:70)
    at webwork.util.InjectionUtils.invoke(InjectionUtils.java:56)
    ... 2 filtered
    at com.atlassian.jira.action.JiraActionSupport.execute(JiraActionSupport.java:63)
    ... 7 filtered
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    ... 48 filtered
    at com.atlassian.greenhopper.jira.filters.ClassicBoardRouter.doFilter(ClassicBoardRouter.java:62)
    ... 12 filtered
    at com.atlassian.web.servlet.plugin.request.RedirectInterceptingFilter.doFilter(RedirectInterceptingFilter.java:21)
    ... 56 filtered
    at com.atlassian.jira.security.JiraSecurityFilter.lambda$doFilter$0(JiraSecurityFilter.java:66)
    ... 1 filtered
    at com.atlassian.jira.security.JiraSecurityFilter.doFilter(JiraSecurityFilter.java:64)
    ... 39 filtered
    at com.atlassian.jira.servermetrics.CorrelationIdPopulatorFilter.doFilter(CorrelationIdPopulatorFilter.java:30)
    ... 10 filtered
    at com.atlassian.web.servlet.plugin.request.RedirectInterceptingFilter.doFilter(RedirectInterceptingFilter.java:21)
    ... 4 filtered
    at com.atlassian.web.servlet.plugin.LocationCleanerFilter.doFilter(LocationCleanerFilter.java:36)
    ... 26 filtered
    at com.atlassian.jira.servermetrics.MetricsCollectorFilter.doFilter(MetricsCollectorFilter.java:25)
    ... 24 filtered
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$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)
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