Player disconnect when get an item

First of all, sorry for my bad english

I manage a modded server, play it with friends. When someone get a blank map or a treasure map, the server disconnect the player and keep doing it. The only way we found to "fix" this problem is deleting the "player data" but then the player has to start all over again. And we can't find which mod is the problem. Can someone help us please ?  

Here is the log: https://mclo.gs/Z1MIpC7

Quote from Powerful845tiger

Try deleting playerdata: https://support.aternos.org/hc…lete-someones-player-file. By deleting player data your inventories, achievements, location, etc will be deleted

We already tried:

Quote

The only way we found to "fix" this problem is deleting the "player data" but then the player has to start all over again.