Using 1.2.7 and I saw this in my console a moment ago:
10/28 10:39:24 | Failed to call hook 'OnOvenToggle' on plugin 'FurnaceLevels v1.2.8' (ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index)
at System.ThrowHelper.ThrowArgumentOutOfRangeException (System.ExceptionArgument argument, System.ExceptionResource resource) [0x00029] in <eae584ce26bc40229c1b1aa476bfa589>:0
at System.ThrowHelper.ThrowArgumentOutOfRangeException () [0x00000] in <eae584ce26bc40229c1b1aa476bfa589>:0
at Oxide.Plugins.FurnaceLevels+FurnaceUpgrades.StartCooking () [0x000a8] in <1025a67eaae94f38b6e66118c76c9cdb>:0
at Oxide.Plugins.FurnaceLevels.OnOvenToggle (StorageContainer oven, BasePlayer player) [0x0006e] in <1025a67eaae94f38b6e66118c76c9cdb>:0
at Oxide.Plugins.FurnaceLevels.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x003c9] in <1025a67eaae94f38b6e66118c76c9cdb>:0
at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <60c318df79ed41688ea59335e48d61ad>:0
at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <9882f28dc2204b4dba514a9ad18f5042>:0
at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <9882f28dc2204b4dba514a9ad18f5042>:0
I don't know the circumstances around what happened when that error occured. I just saw it in the console.