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

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at org.zkoss.zss.ui.impl.CellFormatHelper.escapeText(
at org.zkoss.zss.ui.impl.CellFormatHelper.getHyperlinkHtml(
at org.zkoss.zss.ui.impl.CellFormatHelper.getRichCellHtmlText(
at org.zkoss.zssex.ui.impl.CellDisplayLoaderImpl.getCellHtmlText(
at org.zkoss.zss.ui.Spreadsheet$ExtraCtrl.getCellAttr(
at org.zkoss.zss.ui.Spreadsheet$ExtraCtrl.getRangeAttrs(
at org.zkoss.zss.ui.Spreadsheet.createActiveRange(
at org.zkoss.zss.ui.Spreadsheet.renderProperties(
at org.zkoss.zk.ui.AbstractComponent.redraw(
at org.zkoss.zk.ui.AbstractComponent.redrawChildren(

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