What might cause this?
(22:57:40) | Failed to call hook 'OnCollectiblePickup' on plugin 'ZLevelsRemastered v2.9.6' (KeyNotFoundException: The given key was not present in the dictionary.)
at System.Collections.Generic.Dictionary`2[TKey,TValue].get_Item (TKey key) [0x0001e] in <a8ed250850854b439cedc18931a314fe>:0
at Oxide.Plugins.ZLevelsRemastered.GUIUpdateSkill (BasePlayer player, System.String skill) [0x0000c] in <539c12913b4d4b6d962da1da9d95653a>:0
at Oxide.Plugins.ZLevelsRemastered.levelHandler (BasePlayer player, Item item, System.String skill) [0x00329] in <539c12913b4d4b6d962da1da9d95653a>:0
at Oxide.Plugins.ZLevelsRemastered.OnCollectiblePickup (Item item, BasePlayer player, CollectibleEntity entity) [0x001b8] in <539c12913b4d4b6d962da1da9d95653a>:0
at Oxide.Plugins.ZLevelsRemastered.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00962] in <539c12913b4d4b6d962da1da9d95653a>:0
at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <41771c7bc8d246d0b0a34c2f0d27f2cb>:0
at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <b0a93b504f034a0db8b1c3d2503c0987>:0
at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <b0a93b504f034a0db8b1c3d2503c0987>:0