Errors in console

I get this error in the console from this plugin

Failed to call hook 'OnEntityKill' on plugin 'StashWarningSystem v1.4.4' (NullReferenceException: Object reference not set to an instance of an object)
at Oxide.Plugins.StashWarningSystem.OnEntityKill (StorageContainer entity) [0x0008a] in <40fdd1b927344dd2ab40eba80e603ccd>:0
at Oxide.Plugins.StashWarningSystem.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x001e7] in <40fdd1b927344dd2ab40eba80e603ccd>:0
at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <87ce9ac9776a48658bc55eae6debe38b>:0
at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <18d4f19bbc844191b11ed9e69284d09b>:0
at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <18d4f19bbc844191b11ed9e69284d09b>:0

Changed Status from Pending to Work in Progress

Changed Fixed In to Next Version

Changed Status from Work in Progress to Closed