Failed to call hook 'MapSave' on plugin 'SignTool v1.0.7' (NullReferenceException: )

[That3DPrinterGuy]

Hello, wonderful plugin and just what I was looking for. When I try to save my map I get this error in console, any help?

Thanks.

Failed to call hook 'MapSave' on plugin 'SignTool v1.0.7' (NullReferenceException: )
  at (wrapper managed-to-native) UnityEngine.Component.get_transform(UnityEngine.Component)
  at Oxide.Plugins.SignTool.XMLEncode () [0x00044] in :0 
  at Oxide.Plugins.SignTool.MapSave (BasePlayer player, System.String command, System.String[] args) [0x0001c] in :0 
  at Oxide.Plugins.SignTool.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00cfb] in :0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in :0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in :0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in :0