java.lang.IllegalArgumentException: source cannot be null!

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java.lang.IllegalArgumentException: source cannot be null!
at com.comphenix.protocol.reflect.FuzzyReflection.getFields(FuzzyReflection.java:582)
at com.comphenix.protocol.reflect.FuzzyReflection.getFieldListByType(FuzzyReflection.java:415)
at com.comphenix.protocol.reflect.FuzzyReflection.getFieldByType(FuzzyReflection.java:394)
at com.comphenix.protocol.reflect.accessors.Accessors.getFieldAccessor(Accessors.java:57)
at com.comphenix.protocol.injector.netty.ChannelInjector.handleLogin(ChannelInjector.java:595)
at com.comphenix.protocol.injector.netty.ChannelInjector.decode(ChannelInjector.java:534)
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:232)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:131)
at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337)
at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323)
at com.comphenix.protocol.injector.netty.ChannelInjector$4.channelRead(ChannelInjector.java:273)
at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337)
at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:173)
at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337)
at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323)
at io.netty.handler.timeout.ReadTimeoutHandler.channelRead(ReadTimeoutHandler.java:149)
at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337)
at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323)
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:785)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:100)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:480)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:447)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:341)
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101)
at java.lang.Thread.run(Thread.java:745)

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