Tried logging in and the server started throwing an error at me:
15.3.2021 06:40:25 [Notification] Delayed join, need to load one spawn chunk first.
15.3.2021 06:40:25 [Notification] Placing player at 511951.9375 185 511782.78125
15.3.2021 06:40:28 [Fatal] System.NullReferenceException: Object reference not set to an instance of an object.
at XSkills.BarrelRecipePatch.Prefix(ItemSlot[] inputslots, ItemStack& __state)
at Vintagestory.API.Common.BarrelRecipe.TryCraftNow_Patch2(BarrelRecipe this, ICoreAPI api, Double nowSealedHours, ItemSlot[] inputslots)
at Vintagestory.GameContent.BlockEntityBarrel.OnEvery3Second(Single dt)
at Vintagestory.Common.EventManager.TriggerGameTick(Int64 ellapsedMilliseconds, IWorldAccessor world)
at Vintagestory.Server.CoreServerEventManager.TriggerGameTick(Int64 ellapsedMilliseconds, IWorldAccessor world)
at Vintagestory.Server.ServerMain.Process()
It loops this error until I ctrl+c the server.
Removing xskills_v0.5.0-PR1.zip from my mods folder ensures this error doesn't happen. I've been running the server for a week or two now without issues, so I'm not sure if this is related to another mod or an item someone placed while I was logged out.