Quarries losing levels on server restart & 2 other issues

We're having one big issue with this plugin, coupled with two other warnings that come up in Console every time the server starts...  

The big issue is that some quarries and pumpjacks lose some of their upgrades when the server restarts.  Not sure where the data is stored here (in the save file?) but it seems to be a regularly occurring intermittent issue that pops up.  

We're also getting two errors kicked into the RCON during boot:  

 

Failed to call hook 'OnQuarryConsumeFuel' on plugin 'QuarryLevels v2.0.0' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.QuarryLevels.OnQuarryConsumeFuel (MiningQuarry quarry, Item item) [0x00042] in <7b4cc7a2f2ef4f21a4166b504f3bb270>:0 
  at Oxide.Plugins.QuarryLevels.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x004c1] in <7b4cc7a2f2ef4f21a4166b504f3bb270>:0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <09575a60985045248bcb43b20faeeb99>:0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <d5f57e12edfe4fa0b5c5dbdd9b51eff8>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <d5f57e12edfe4fa0b5c5dbdd9b51eff8>:0  
(Filename: ./Runtime/Export/Debug/Debug.bindings.h Line: 35)

And then also:  
 

QuarryLocks has replaced the 'global.ql' console command previously registered by QuarryLevels 
(Filename: ./Runtime/Export/Debug/Debug.bindings.h Line: 35)

And finally, this is more of a nuisance than a huge issue:  A pumpjack that's running when the server restarts doesn't continue running on server boot, so you have to make sure to start your PJ's every morning.  
 

I can confirm both the errors on startup and the lost levels on restart.