I'm not sure if this is a problem or not, but this popped up when our server rebooted for a one player. The server is restarting now so I can't ask if anything 'broke' with the contents they had in there.

07/03 3:00:08 PM | [Backpacks] Error when killing player backpack <steamID_REMOVED>:
System.NullReferenceException: Object reference not set to an instance of an object
at Oxide.Plugins.Backpacks+Backpack.ForceCloseLooter (BasePlayer looter) [0x00006] in <6071134d26d54877ac86155b51395226>:0
at Oxide.Plugins.Backpacks+Backpack.ForceCloseAllLooters () [0x0001d] in <6071134d26d54877ac86155b51395226>:0
at Oxide.Plugins.Backpacks+Backpack.Kill () [0x00000] in <6071134d26d54877ac86155b51395226>:0
at Oxide.Plugins.Backpacks+BackpackManager+<SaveAllAndKill>d__38.MoveNext () [0x000ee] in <6071134d26d54877ac86155b51395226>:0