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

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java.lang.NullPointerException:
at com.atlassian.jira.web.action.issue.EditComment.doValidation(EditComment.java:45)
at webwork.action.ActionSupport.validate(ActionSupport.java:373)
at webwork.action.ActionSupport.execute(ActionSupport.java:150)
at com.atlassian.jira.action.JiraActionSupport.execute(JiraActionSupport.java:54)
at webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:132)
at com.atlassian.jira.web.dispatcher.JiraServletDispatcher.service(JiraServletDispatcher.java:209)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at com.atlassian.jira.web.filters.AccessLogFilter.doFilter(AccessLogFilter.java:73)

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