io.netty.util.IllegalReferenceCountException: refCnt: 0

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io.netty.util.IllegalReferenceCountException: refCnt: 0
at io.netty.buffer.AbstractByteBuf.ensureAccessible(AbstractByteBuf.java:1407)
at io.netty.buffer.AbstractByteBuf.checkIndex(AbstractByteBuf.java:1353)
at io.netty.buffer.PooledUnsafeDirectByteBuf.internalNioBuffer(PooledUnsafeDirectByteBuf.java:331)
at io.netty.buffer.ByteBufUtil.decodeString(ByteBufUtil.java:614)
at io.netty.buffer.AbstractByteBuf.toString(AbstractByteBuf.java:1213)
at io.netty.buffer.AbstractByteBuf.toString(AbstractByteBuf.java:1208)
at com.netas.sv.proxy.InboundPrinterHandler.channelRead(InboundPrinterHandler.java:16)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:373)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:359)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:351)
at com.netas.sv.proxy.HexDumpProxyFrontendHandler.channelRead(HexDumpProxyFrontendHandler.java:67)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:373)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:359)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:351)
at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1334)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:373)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:359)
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:926)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:129)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:651)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:574)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:488)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:450)
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:873)
at java.lang.Thread.run(Thread.java:745)

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