Even with protections, a crash may happen. Use a service like or PteroDragon to auto-restart your server within 60 seconds. Also, backup your data/ folder daily to prevent dupe-loop persistence.
Before understanding the crasher, you must understand the . A dupe is a saved snapshot of props, contraptions, and advanced duplications (AdvDupe 2). When you build a machine—say, a car or a hoverboard—you can save it as a .dupe file and spawn it instantly on any server that supports the tool.
Creations with hundreds of complex constraints (ropes, welds, hydraulics) that cause a "physics freakout" the moment they are unfrozen, locking up the CPU. Invalid Data Dupes: