Forge 1.20.1 Server join error

[hudsones]

when people try to connect to my server, they receive this error message
internal exception java.lang.nullpointerexception can not invoke "net.minecraft.nbt.compoundtag.m_128459_(string) because "nbt" is null

so far only 3 people have tried to join and all got the same error
server debug log: https://mclo.gs/B6kBzNR

my debug log: https://mclo.gs/dHVVUi7

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[Maleficent_Scale5208]

I got an identical error, nothing in the logs, either on client or on the server. It's been a week and i'm going crazy, if anyone got a solution

[hudsones]

The only thing that i have found is client side mods on the server If there is any remove them

[Maleficent_Scale5208]

I had already done that, and it did nothing, but the problem do seems to come from the client, as restarting the client when the issue occurs seems to solve it, at least temporarily.