NullReferenceException at UnloadError
15:04 [Error] Failed to call hook 'Unload' on plugin 'BuildingWorkbench v1.2.3' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.BuildingWorkbench.Unload () [0x0003f] in <886b5af3beee4d4794dfca8300ddeae9>:0 
  at Oxide.Plugins.BuildingWorkbench.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x005c0] in <886b5af3beee4d4794dfca8300ddeae9>: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 <9882f28dc2204b4dba514a9ad18f5042>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <9882f28dc2204b4dba514a9ad18f5042>:0 
Error] Failed to call hook 'Unload' on plugin 'BuildingWorkbench v1.2.3' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.BuildingWorkbench.Unload () [0x0003f] in <7a5a65d7bef7468e8cd3cf3a13ea2811>:0 
  at Oxide.Plugins.BuildingWorkbench.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x005c0] in <7a5a65d7bef7468e8cd3cf3a13ea2811>: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 <9882f28dc2204b4dba514a9ad18f5042>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <9882f28dc2204b4dba514a9ad18f5042>:0
Tanki
Error] Failed to call hook 'Unload' on plugin 'BuildingWorkbench v1.2.3' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.BuildingWorkbench.Unload () [0x0003f] in <7a5a65d7bef7468e8cd3cf3a13ea2811>:0 
  at Oxide.Plugins.BuildingWorkbench.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x005c0] in <7a5a65d7bef7468e8cd3cf3a13ea2811>: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 <9882f28dc2204b4dba514a9ad18f5042>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <9882f28dc2204b4dba514a9ad18f5042>:0

Solved for me

This should be resolved in version 1.3.2

Thanks!