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

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java.lang.NullPointerException:
at net.sf.jsfcomp.chartcreator.ChartListener.afterPhase(ChartListener.java:44)
at com.sun.faces.portlet.LifecycleImpl.phase(LifecycleImpl.java:256)
at com.sun.faces.portlet.LifecycleImpl.execute(LifecycleImpl.java:156)
at com.icesoft.faces.webapp.xmlhttp.PersistentFacesPortlet.render(PersistentFacesPortlet.java:341)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
at com.liferay.portlet.CachePortlet._invoke(CachePortlet.java:333)
at com.liferay.portlet.CachePortlet.render(CachePortlet.java:182)
at org.apache.jsp.html.portal.render_005fportlet_jsp._jspService(render_005fportlet_jsp.java:949)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at com.liferay.filters.strip.StripFilter.doFilter(StripFilter.java:268)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at com.liferay.filters.compression.CompressionFilter.doFilter(CompressionFilter.java:124)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)

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