Badly compressed packet and Tried to read NBT tag that was too big.

In the Image I attached you can see two Minecraft Clients. One is modded with Optifine but that shouldn't change anything since I tested it on the other Client too(both Exceptions are thrown on both Clients).

On both instances I can no longer log onto the Server. The bug does not happen on Singleplayer. On the First Picture I have an Inventory full of Shulkerchests that have Chests with NBT and have many Shulker chests with normal Chests in them.

 

On the second instance I can actually log into the server for about a second before getting kicked. My Inventory there is nearly empty but there is a chest with shulkerchests with chests with nbt. 

 

Whilst I don't think anyone will ever do this in their World griefers that gained operator access can stop players from logging in or generally stop players from entering a chunk.