Failed to call hook 'OnNewSave' on plugin 'SignTracker v3.0.0'

I got this error today after  the new wipe of feb 3, 2022
SignTracker v3.0.0

Failed to call hook 'OnNewSave' on plugin 'SignTracker v3.0.0' (NullReferenceException: Object reference not set to an instance of an object)
at Oxide.Plugins.SignTracker.SaveSignData () [0x00000] in <323f64356dd94dd8a11a15751f631858>:0
at Oxide.Plugins.SignTracker.OnNewSave (System.String filename) [0x0001c] in <323f64356dd94dd8a11a15751f631858>:0
at Oxide.Plugins.SignTracker.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x001be] in <323f64356dd94dd8a11a15751f631858>: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 <dfcb48ea05694263bbc08e62a39c274c>:0
at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <dfcb48ea05694263bbc08e62a39c274c>:0

Hey!

I do not see any changes in this Hook so I dont know why this would cause an error. 
Did the server wipe correctly after the update?
Also, does this make the plugin crash or does it still work after?