Expected behavior

expected to process PING frames to check the client is still active

Actual behavior

when empty frame (just with \n symbol) is received StompSubframeDecoder.decode threws IndexOutOfBoundsException

 private static void skipControlCharacters(ByteBuf buffer) {
         byte b;
         for (;;) {
             b = buffer.readByte();
             if (b != StompConstants.CR && b != StompConstants.LF) {
                 buffer.readerIndex(buffer.readerIndex() - 1);
                 break;
             }
         }
     }

function skipControlCharacters has no readable bytes check of the buffer

Steps to reproduce

build a STOMP server using netty STOMP handlers

Netty version

4.1.52