Having custom spawnpoints on a map corrupts the entire save, resorting to loading a save which is actually empty. Me and friends learned this the hard way after making an entire map with spawns, only to corrupt and "load" with nothing.

[Sandbox Team Manager] lua/entities/sbtm_spawn.lua:25: attempt to index global 'SBTM' (a nil value)
1. unknown - lua/entities/sbtm_spawn.lua:25
2. Spawn - [C]:-1
3. CreateEntityFromTable - lua/includes/modules/duplicator.lua:462
4. unknown - lua/includes/modules/duplicator.lua:753
5. ProtectedCall - [C]:-1
6. oldPaste - lua/includes/modules/duplicator.lua:753
7. Paste - lua/wire/server/wirelib.lua:1219
8. unknown - lua/includes/gmsave.lua:66

[Sandbox Team Manager] lua/entities/sbtm_spawn.lua:29: attempt to index global 'SBTM' (a nil value)
1. unknown - lua/entities/sbtm_spawn.lua:29