I run a carbon server and am getting the error listed below in console when a player joins the server

Failed to call internal hook 'OnPlayerRespawned' on plugin 'Backpacks v3.13.5' [458523914] (Object reference not set to an instance of an object.)
at void Oxide.Plugins.Backpacks.OnPlayerRespawned(BasePlayer player) in /home/container/carbon/plugins/Backpacks.cs:line 418
at object Oxide.Plugins.Backpacks.InternalCallHook(uint hook, object[] args) in Backpacks.cs/Internal:line 627