Steps to Reproduce

1. load filter.xlsx in ZSS-1400
2. select Number filter/Equals in the 1st column

Current Result

SEVERE:
java.lang.NullPointerException
at org.zkoss.zssex.ui.dialog.CustomFiltersCtrl.show(CustomFiltersCtrl.java:103)
at org.zkoss.zssex.ui.impl.ua.CustomFiltersHandler.processAction(CustomFiltersHandler.java:71)
at org.zkoss.zss.ui.impl.ua.AbstractHandler.process(AbstractHandler.java:63)
at org.zkoss.zss.ui.impl.DefaultUserActionManagerCtrl.dispatchAuxAction(DefaultUserActionManagerCtrl.java:326)
at org.zkoss.zss.ui.impl.DefaultUserActionManagerCtrl.onEvent(DefaultUserActionManagerCtrl.java:474)
at org.zkoss.zssex.ui.impl.UserActionManagerCtrlImpl.onEvent(UserActionManagerCtrlImpl.java:321)
at org.zkoss.zss.ui.Spreadsheet$4.onEvent(Spreadsheet.java:458)
at org.zkoss.zk.ui.AbstractComponent.onEvent(AbstractComponent.java:3165)
at org.zkoss.zk.ui.AbstractComponent.service(AbstractComponent.java:3135)
at org.zkoss.zk.ui.AbstractComponent.service(AbstractComponent.java:3077)
at org.zkoss.zk.ui.impl.EventProcessor.process(EventProcessor.java:138)
at org.zkoss.zk.ui.impl.UiEngineImpl.processEvent(UiEngineImpl.java:1846)
at org.zkoss.zk.ui.impl.UiEngineImpl.process(UiEngineImpl.java:1618)
at org.zkoss.zk.ui.impl.UiEngineImpl.execUpdate(UiEngineImpl.java:1321)
at org.zkoss.zk.au.http.DHtmlUpdateServlet.process(DHtmlUpdateServlet.java:606)

Expected Result

no error, dialog popup