Rest store - synchronize data opeartion hangs

ESC[0mESC[33m18:48:44,011 WARNING [io.netty.channel.DefaultChannelPipeline] (nioEventLoopGroup-9-3) An exception was thrown by a user handler's exceptionCaught() method while handling the following exception:: java.lang.IllegalStateException: Already committed
        at org.jboss.resteasy.plugins.server.netty.NettyHttpResponse.reset(NettyHttpResponse.java:148)
        at org.jboss.resteasy.plugins.server.netty.RequestHandler.channelRead0(RequestHandler.java:62)
        at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
        at io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:32)
        at io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:299)
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:380)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:357)
        at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)
        at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137)
        at java.lang.Thread.run(Thread.java:745)