[Bug] Rewards lost on leave

[TheosisOfficial]

If a crate animation is playing and the player leaves the game by closing their game client, they lose their key and their rewards entirely.

[TheosisOfficial]

To add to this, plugins that listen to InventoryCloseEvent and don't account for players being offline when this event is called can throw an exception when the crate animation finishes, despite the player not actually being online to see the animation.