NPE in 500 page

java.lang.NullPointerException
	at com.atlassian.jira.plugin.webresource.JiraWebResourceIntegration.getBaseUrl()Ljava/lang/String;(JiraWebResourceIntegration.java:42)
	at com.atlassian.plugin.webresource.WebResourceManagerImpl.getStaticResourcePrefix(Ljava/lang/String;)Ljava/lang/String;(Optimized Method)
	at _jsp._500page__jsp._jspService(includes/decorators/stylesheettag.jsp:12)
	at com.caucho.jsp.JavaPage.service(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(Optimized Method)
	at com.caucho.jsp.Page.pageservice(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V(Optimized Method)
	at com.caucho.server.dispatch.PageFilterChain.doFilter(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(Optimized Method)
	at com.caucho.server.webapp.DispatchFilterChain.doFilter(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(Optimized Method)
	at com.caucho.server.dispatch.ServletInvocation.service(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(Optimized Method)
	at com.caucho.server.webapp.RequestDispatcherImpl.forward(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;Ljava/lang/String;Lcom/caucho/server/dispatch/Invocation;)V(Optimized Method)
	at com.caucho.server.webapp.RequestDispatcherImpl.error(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(RequestDispatcherImpl.java:113)
	at com.caucho.server.webapp.ErrorPageManager.sendServletError(Ljava/lang/Throwable;Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(ErrorPageManager.java:363)
	at com.caucho.server.webapp.WebAppFilterChain.doFilter(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(Optimized Method)
	at com.caucho.server.dispatch.ServletInvocation.service(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(Optimized Method)
	at com.caucho.server.hmux.HmuxRequest.handleRequest()Z(Optimized Method)
	at com.caucho.server.port.TcpConnection.run()V(Optimized Method)
	at com.caucho.util.ThreadPool.runTasks()V(Optimized Method)
	at com.caucho.util.ThreadPool.run()V(ThreadPool.java:433)
	at java.lang.Thread.run()V(Unknown Source)
	at java.lang.Thread.startThreadFromVM(Ljava/lang/Thread;)V(Optimized Method)