There is a bufferUnderflowException thrown at Kafka server's terminal when i run python consumer

[ghost]

ERROR Closing socket for /127.0.0.1 because of error (kafka.network.Processor) java.nio.BufferUnderflowException at java.nio.Buffer.nextGetIndex(Buffer.java:478) at java.nio.HeapByteBuffer.getInt(HeapByteBuffer.java:336) at kafka.api.FetchRequest$.readFrom(FetchRequest.scala:47) at kafka.api.RequestKeys$$anonfun$2.apply(RequestKeys.scala:35) at kafka.api.RequestKeys$$anonfun$2.apply(RequestKeys.scala:35) at kafka.network.RequestChannel$Request.(RequestChannel.scala:49) at kafka.network.Processor.read(SocketServer.scala:353) at kafka.network.Processor.run(SocketServer.scala:245) at java.lang.Thread.run(Thread.java:695)