lazy-container + filterTable.

Hi,

 https://github.com/ondrej-kvasnovsky/lazy-container
I am using Lazy-container addon + FilterTable addons .
for loading the data lazily from database it is working fine fro me. 

but in FilterTable while  filtering is not working.
i am getting error like.

com.vaadin.event.ListenerMethod$MethodException: Invocation of method valueChange in org.tepi.filtertable.FilterFieldGenerator$2 failed.
    at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:528)
    at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:198)
    at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:161)
    at com.vaadin.server.AbstractClientConnector.fireEvent(AbstractClientConnector.java:977)
    at com.vaadin.ui.AbstractField.fireValueChange(AbstractField.java:1137)
    at com.vaadin.ui.AbstractField.setValue(AbstractField.java:548)
    at com.vaadin.ui.AbstractField.setValue(AbstractField.java:451)
    at com.vaadin.ui.AbstractTextField.setValue(AbstractTextField.java:455)
    at org.tepi.filtertable.FilterFieldGenerator$1.textChange(FilterFieldGenerator.java:425)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:508)
    at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:198)
    at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:161)
    at com.vaadin.server.AbstractClientConnector.fireEvent(AbstractClientConnector.java:977)
    at com.vaadin.ui.AbstractTextField.firePendingTextChangeEvent(AbstractTextField.java:404)
    at com.vaadin.ui.AbstractTextField.changeVariables(AbstractTextField.java:213)
    at com.vaadin.server.communication.ServerRpcHandler.changeVariables(ServerRpcHandler.java:486)
    at com.vaadin.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:305)
    at com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:184)
    at com.vaadin.server.communication.PushHandler$3.run(PushHandler.java:176)
    at com.vaadin.server.communication.PushHandler.callWithUi(PushHandler.java:255)
    at com.vaadin.server.communication.PushHandler.access$200(PushHandler.java:58)
    at com.vaadin.server.communication.PushHandler$1.onRequest(PushHandler.java:78)
    at org.atmosphere.cpr.AsynchronousProcessor.action(AsynchronousProcessor.java:205)
    at org.atmosphere.cpr.AsynchronousProcessor.suspended(AsynchronousProcessor.java:104)
    at org.atmosphere.container.TomcatWebSocketUtil.doService(TomcatWebSocketUtil.java:154)
    at org.atmosphere.container.Tomcat7Servlet30SupportWithWebSocket.service(Tomcat7Servlet30SupportWithWebSocket.java:62)
    at org.atmosphere.cpr.AtmosphereFramework.doCometSupport(AtmosphereFramework.java:2075)
    at org.atmosphere.websocket.DefaultWebSocketProcessor.dispatch(DefaultWebSocketProcessor.java:570)
    at org.atmosphere.websocket.DefaultWebSocketProcessor$3.run(DefaultWebSocketProcessor.java:332)
    at org.atmosphere.util.VoidExecutorService.execute(VoidExecutorService.java:101)
    at org.atmosphere.websocket.DefaultWebSocketProcessor.dispatch(DefaultWebSocketProcessor.java:327)
    at org.atmosphere.websocket.DefaultWebSocketProcessor.invokeWebSocketProtocol(DefaultWebSocketProcessor.java:424)
    at org.atmosphere.websocket.DefaultWebSocketProcessor.dispatchReader(DefaultWebSocketProcessor.java:794)
    at org.atmosphere.websocket.DefaultWebSocketProcessor.invokeWebSocketProtocol(DefaultWebSocketProcessor.java:526)
    at org.atmosphere.container.TomcatWebSocketHandler.onTextData(TomcatWebSocketHandler.java:104)
    at org.apache.catalina.websocket.StreamInbound.doOnTextData(StreamInbound.java:191)
    at org.apache.catalina.websocket.StreamInbound.onData(StreamInbound.java:139)
    at org.apache.coyote.http11.upgrade.UpgradeProcessor.upgradeDispatch(UpgradeProcessor.java:88)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:621)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
    at com.vaadin.ui.CustomTable.getVisibleCellsNoCache(CustomTable.java:2184)
    at com.vaadin.ui.CustomTable.refreshRenderedCells(CustomTable.java:1709)
    at com.vaadin.ui.CustomTable.enableContentRefreshing(CustomTable.java:3234)
    at org.tepi.filtertable.FilterTable.setRefreshingEnabled(FilterTable.java:371)
    at org.tepi.filtertable.FilterFieldGenerator.updateFilterForField(FilterFieldGenerator.java:589)
    at org.tepi.filtertable.FilterFieldGenerator.access$100(FilterFieldGenerator.java:43)
    at org.tepi.filtertable.FilterFieldGenerator$2.valueChange(FilterFieldGenerator.java:534)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:508)