Forge Version: 28.1.107
MC-Version: 1.14.4
Ruins Mod Version: ruins-1.14.4.4 | This one: https://www.curseforge.com/minecraft/mc-mods/ruins-structure-spawning-system/files/2830120

Crash-Report: https://gist.github.com/Gbergz/982bb258efa63d1b7c004e46e713da02

While Ruins was in the process of spawning a template, it appears the actual lockup is in the code of the "farlanders" mod.

com.legacy.farlanders.world.FarlanderLootFeature.place(FarlanderLootFeature.java:89)

Are you using your own templates? Using large (spanning multiple chunks) templates can no longer be considered safe at all, as any worldgen triggered while placing templates will lock up minecraft.

I really dislike how they implemented that...

I'm using all templates found inside your Jar, should i not be using them? Because before adding them no "structures" were spawning.

I see. The next step would be to get the latest.log logfile from when the crash happened and hopefully have some information about which template exactly it was...