Error when saving roadsign custom loot

Hello, trying to save this to drop 2x the amount, when i enable and save i get an error on my terminal as below. all other sections seam to work ok 

" at Oxide.Plugins.Loottable+PlayerUi+<>cDisplayClass58_0.<CreateInputField>b1 (BasePlayer _, System.String s) [0x00000] in <b18d2b46a16e432a97b8736543df24c4>:0
  at PluginComponents.Loottable.Core.BasePlugin.HandleCommand (ConsoleSystem+Arg arg) [0x00066] in <b18d2b46a1[Loottable] Failed to run UI command f56aaa94-ec39-43d3-8b12-c88198e37b48: System.NullReferenceException: Object reference not set to an instance of an object"

Just to add i have found this applies to any crate when trying to enable custom loot and save

Unfortunately I am unable to reproduce your error.

It is most likely caused by a corrupted data file. Please make a backup of your data folder, delete it WHILE THE PLUGIN IS UNLOADED and then load the plugin again. If the error is gone then your data files were corrupted.