Data Stores attempt to index a nil value with a leaderstat that DOES exist

[Yarik_superpro (IMoggedOOP)]

• Why are you defining a method if you never use self?

You better to learn about datastore implementation from ProfileStore - Save your player data easy (DataStore Module) and Data stores | Documentation - Roblox Creator Hub
ProfileStore is a pretty well made module and you could either study off from it or implement it into your game or do both (recomended)