showcase-portlet:
Tooltip > Delegate
Mousing over the table triggers a NPE popup and the page becomes partially blurred.
This error can be consistently reproduced on this demo.

Server error:
19:46:44,059 ERROR [ExceptionHandlerAjaxImpl:71] /resources/examples/ace/tooltip/delegateTooltip.xhtml @65,119 delegateD
isplayListener="#{delegateTooltipBean.listener}": java.lang.NullPointerException
Feb 09, 2016 7:46:44 PM com.sun.faces.context.AjaxExceptionHandlerImpl handlePartialResponseError
SEVERE: java.lang.NullPointerException
        at org.icefaces.samples.showcase.example.ace.tooltip.DelegateTooltipBean.extractIndex(DelegateTooltipBean.java:9
3)
        at org.icefaces.samples.showcase.example.ace.tooltip.DelegateTooltipBean.listener(DelegateTooltipBean.java:73)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.apache.el.parser.AstValue.invoke(AstValue.java:278)
        at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:274)
        at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
        at org.icefaces.ace.component.tooltip.Tooltip.broadcast(Tooltip.java:66)
        at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)
        at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)
        at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
        at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
        at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
        at com.liferay.faces.bridge.internal.BridgePhaseResourceImpl.execute(BridgePhaseResourceImpl.java:271)
        at com.liferay.faces.bridge.internal.BridgeImpl.doFacesRequest(BridgeImpl.java:157)
        at javax.portlet.faces.GenericFacesPortlet.serveResource(GenericFacesPortlet.java:178)
        at com.liferay.portlet.FilterChainImpl.doFilter(FilterChainImpl.java:122)
        at com.liferay.portlet.ScriptDataPortletFilter.doFilter(ScriptDataPortletFilter.java:82)
        at com.liferay.portlet.FilterChainImpl.doFilter(FilterChainImpl.java:116)
        at com.liferay.portal.kernel.portlet.PortletFilterUtil.doFilter(PortletFilterUtil.java:71)
..............