Error while Upload

Hello Guys,

 I updated the vaadin to version 7.7.1 and get the following exception while uploading a file. it has been working fine. Any help would be appreciated. 

Client Browser Console  Log : 

Uncaught Error: message length "for(;;);[{"changes":{},"resources":{},"locales":{},"meta":{"appError":{"caption":"Internal error","url":null,"message":"Please notify the administrator.<br/>Take note of any unsaved data, and <u>click here</u> or press ESC to continue.","details":null}},"syncId":-1}]12717" is not a number
    at s (vaadinPush.js?v=7.7.7:1)
    at WebSocket.ax.onmessage (vaadinPush.js?v=7.7.7:1)

Server side log

java.lang.NullPointerException
at com.vaadin.server.communication.ServerRpcHandler.parseServerRpcInvocation(ServerRpcHandler.java:571)
at com.vaadin.server.communication.ServerRpcHandler.parseInvocation(ServerRpcHandler.java:534)
at com.vaadin.server.communication.ServerRpcHandler.parseInvocations(ServerRpcHandler.java:500)
at com.vaadin.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:336)
at com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:273)
at com.vaadin.server.communication.PushHandler$2.run(PushHandler.java:148)
at com.vaadin.server.communication.PushHandler.callWithUi(PushHandler.java:240)
at com.vaadin.server.communication.PushHandler.onMessage(PushHandler.java:494)
at com.vaadin.server.communication.PushAtmosphereHandler.onMessage(PushAtmosphereHandler.java:87)
at com.vaadin.server.communication.PushAtmosphereHandler.onRequest(PushAtmosphereHandler.java:77)
at org.atmosphere.cpr.AsynchronousProcessor.action(AsynchronousProcessor.java:199)
at org.atmosphere.cpr.AsynchronousProcessor.suspended(AsynchronousProcessor.java:107)
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:571)
at org.atmosphere.websocket.DefaultWebSocketProcessor$3.run(DefaultWebSocketProcessor.java:333)
at org.atmosphere.util.VoidExecutorService.execute(VoidExecutorService.java:101)
at org.atmosphere.websocket.DefaultWebSocketProcessor.dispatch(DefaultWebSocketProcessor.java:328)
at org.atmosphere.websocket.DefaultWebSocketProcessor.invokeWebSocketProtocol(DefaultWebSocketProcessor.java:425)
at org.atmosphere.websocket.DefaultWebSocketProcessor.dispatchReader(DefaultWebSocketProcessor.java:795)
at org.atmosphere.websocket.DefaultWebSocketProcessor.invokeWebSocketProtocol(DefaultWebSocketProcessor.java:527)
at org.atmosphere.container.TomcatWebSocketHandler.onTextData(TomcatWebSocketHandler.java:104)
at org.apache.catalina.websocket.StreamInbound.doOnTextData(StreamInbound.java:191)
at org.apache.catalina.websocket.StreamInbound.onData(StreamInbound.java:139)
at org.apache.coyote.http11.upgrade.UpgradeProcessor.upgradeDispatch(UpgradeProcessor.java:88)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:313)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

Hi. This seems to me the same as https://github.com/vaadin/framework/issues/8629 and there is a fix currently in progress, should be out with 7.7.8 (probably next week).