Minecraft always crashes when I go into a dimension what can you do about it (multiplayer with mods)?

First of all, here is the mod package, if it helps or if someone is interested (it is best to use an AdBlocker!):

https://www.file-upload.net/download-14139717/LordoftheMods-1.7.10.zip.html

Here's the problem: I've been playing with my friends on a Minecraft world for a few days and then we were eventually ready to go into the Nether. However, the game just crashed after some loading time and I tried a different dimension with a friend on a new map with the same mods, but the game crashed again, does anyone know whether the problem arises due to a mod or the dimension change in multiplayer is simply not possible?

Apart from testing one mod after another, there's not much you can do, sometimes it is also due to the performance of the PC or the server.

you can also check if you have installed the recommended or the latest forge version, recommended is better

The best thing to do is install one mod after another and see if it works until it just doesn't work anymore, then you have found the culprit