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java.lang.NullPointerException: 	at com.vaadin.addon.spreadsheet.command.CellValueCommand.(CellValueCommand.java:95)	at com.vaadin.addon.spreadsheet.CellValueManager.onCellValueChange(CellValueManager.java:550)	at com.vaadin.addon.spreadsheet.SpreadsheetHandlerImpl.cellValueEdited(SpreadsheetHandlerImpl.java:138)	at sun.reflect.GeneratedMethodAccessor700.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:158)	at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:118)	at com.vaadin.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:408)	at com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:273)	at com.vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:79)	at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:41)	at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1409)	at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:364)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)	at org.eclipse.jetty.servlets.UserAgentFilter.doFilter(UserAgentFilter.java:83)	at org.eclipse.jetty.servlets.GzipFilter.doFilter(GzipFilter.java:364)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)	at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671)	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:518)	at org.jboss.threads.SimpleDirectExecutor.execute(SimpleDirectExecutor.java:33)	at org.jboss.threads.QueueExecutor.runTask(QueueExecutor.java:801)	at org.jboss.threads.QueueExecutor.access$100(QueueExecutor.java:45)	at org.jboss.threads.QueueExecutor$Worker.run(QueueExecutor.java:821)	at java.lang.Thread.run(Thread.java:745)	at org.jboss.threads.JBossThread.run(JBossThread.java:122)