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So when you join the server the client side game crashes right?
Share your client log:
1. open your minecraft installation path (enter %appdata%/.minecraft in the file explorer )
2. open the logs folder
3. open the "latest" or "latest.log" file with a text editor
4. copy and paste the content of the file to https://mclo.gs/
5. send the link here
I can't see it crash in this log. Once it crashes please share the client log
Try deleting the config folder which is located in the minecraft installation path (enter %appdata%/.minecraft in the file explorer ) and if it doesn't work then try deleting aether mod
