Player teleported to me while I was in spectre and now they can't login to server

[LevitheGiant]

[MC ETERNAL LITE] I'm on a small server with a few people and one of them teleported to me while I was in the pocket dimension. after that he got stuck in a void and couldn't move so he decided to relog. when he tried to log back into the server, it popped up with the message:

" Internal Exception: io.netty.handler.codec.DecoderException: java.lang.IdexOutOfBoundsException: ReaderIndex(51) + Lengh(2) Exceeds WriterIndex(51): PooledUnsafeDirectByteBuf(ridx: 51, widx: 51, cap: 51)"

We aren't sure what this is but the owner is planning on trying to fix it in the morning. I just wanted to see if you had a quick solution so that the server owner has no trouble in fixing this issue. Thank you for taking your time to read this.

PHOTO OF ERROR MESSAGE:

[PandaReign]

i know this is literally years ago but ever fin the fix. im heart broken cause i think i broke my bfs charecter