KeyNotFoundException: The given key was not present in the dictionary.
at System.Collections.Generic.Dictionary`2[TKey,TValue].get_Item (TKey key) [0x0001e] in <ac823e2bb42b41bda67924a45a0173c3>:0 
at Oxide.Plugins.RemoverTool.GetRefund (BaseEntity TargetEntity) [0x002bb] in <24760b4fb595427ab431f3ee137de295>:0 
at Oxide.Plugins.RemoverTool.GUIRefundUpdate (BasePlayer player, System.Boolean useRefund, BaseEntity TargetEntity) [0x00027] in <24760b4fb595427ab431f3ee137de295>:0 
at Oxide.Plugins.RemoverTool+ToolRemover.RemoveUpdate () [0x000da] in <24760b4fb595427ab431f3ee137de295>:0​

This popped up at some point. Cans omeone explain what it might mean?