Question Server crashes

[Frameworks]

Server crashes after breaking a block or dropping a item.
Error Code:
"[Playername] lost connection: Internal Exception: io.netty.handler.codec.EncoderException: java.lang.NullPointerException: Cannot invoke "java.util.List.iterator()" because "trackedValues" is null"

 

[stefvanschie]

Try reproducing this without plugins. If this issue still occurs without plugins installed, it is probably a bug, in which case please report it to the bug tracker: https://github.com/PaperMC/Paper/issues.