java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.atlassian.jira.plugin.issuenav.IssueNavAction.doTabContent(IssueNavAction.java:668)
at com.atlassian.jira.plugin.issuenav.IssueNavAction.doDefault(IssueNavAction.java:251)
at sun.reflect.GeneratedMethodAccessor1546.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at webwork.util.InjectionUtils$DefaultInjectionImpl.invoke(InjectionUtils.java:70)
at webwork.util.InjectionUtils.invoke(InjectionUtils.java:56)
at webwork.action.ActionSupport.invokeCommand(ActionSupport.java:438)
at webwork.action.ActionSupport.execute(ActionSupport.java:157)
at com.atlassian.jira.action.JiraActionSupport.execute(JiraActionSupport.java:88)
at webwork.interceptor.DefaultInterceptorChain.proceed(DefaultInterceptorChain.java:39)
at webwork.interceptor.NestedInterceptorChain.proceed(NestedInterceptorChain.java:31)
at webwork.interceptor.ChainedInterceptor.intercept(ChainedInterceptor.java:16)

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