Error loading save

After automated server restart, it shuts down, but can't start up with following messages. Tried to Update Oxide+Rust, tried to unload all plugins, tried to delete all players VendingMachines OnServerInitialized. Nothing helps.

Anyone any clues what could cause this problem? First time server managed to start after machine-restart (6 hours later).

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<color=#aff>[sign.medium.wood[28421653]] Frame 0 (id=3866140899) doesn't exist, clearing</color> 
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 35)

Error loading save (server/PVE/map.07.01.202.sav) 
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 35)

DivideByZeroException: Attempted to divide by zero.
  at VendingMachine.RefreshSellOrderStockLevel (ItemDefinition itemDef) [0x0013d] in <29c7e31a9db8498285e1197fb5c6554b>:0 
  at VendingMachine.Load (BaseNetworkable+LoadInfo info) [0x0006e] in <29c7e31a9db8498285e1197fb5c6554b>:0 
  at SaveRestore.Load (System.String strFilename, System.Boolean allowOutOfDateSaves) [0x00470] in <29c7e31a9db8498285e1197fb5c6554b>:0 
UnityEngine.DebugLogHandler:Internal_LogException(Exception, Object)
UnityEngine.DebugLogHandler:LogException(Exception, Object)
UnityEngine.Logger:LogException(Exception, Object)
UnityEngine.Debug:LogException(Exception)
SaveRestore:Load(String, Boolean)
ServerMgr:Initialize(Boolean, String, Boolean, Boolean)
<StartServer>d__19:MoveNext()
UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr)
 
(Filename: <29c7e31a9db8498285e1197fb5c6554b> Line: 0)

Initializing 214465 entity links
	39677 / 214465
	done.
Initializing 44489 stability supports
	done.
Initializing 40339 conditional models
NullReferenceException: Object reference not set to an instance of an object
  at BuildingBlock.GetGrade (BuildingGrade+Enum iGrade) [0x00000] in <29c7e31a9db8498285e1197fb5c6554b>:0 
  at BuildingBlock.get_currentGrade () [0x00000] in <29c7e31a9db8498285e1197fb5c6554b>:0 
  at BuildingBlock.ChangeSkin () [0x00009] in <29c7e31a9db8498285e1197fb5c6554b>:0 
  at BuildingBlock.UpdateSkin (System.Boolean force) [0x00028] in <29c7e31a9db8498285e1197fb5c6554b>:0 
  at SaveRestore.InitializeEntityConditionals () [0x00086] in <29c7e31a9db8498285e1197fb5c6554b>:0 
  at Bootstrap+<StartServer>d__19.MoveNext () [0x0027a] in <29c7e31a9db8498285e1197fb5c6554b>:0 
  at UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) [0x00026] in <745c4d442eef4e08b35b5975d62d89d1>:0 
 
(Filename: <29c7e31a9db8498285e1197fb5c6554b> Line: 0)​
UPD: Server downgrade to Decembers version before XMas-Update, but after Neon-Signages has no Problems with loading that sav.
Sounds like your save is corrupt and may need to be wiped.
5e13a8d5b2bc5.jpg Wulf
Sounds like your save is corrupt and may need to be wiped.

Indeed, we had to wipe the map. But I still can't get it, why downgraded server could load it without any problems.

4th December server-build could load it, 17th December couldn't. FP replied to ticket with "plugins, we don't support them"

Right, hard to say what may have caused it, but likely a plugin related to vending. If a Rust update changes something and a plugin still tries to use something older, very likely to break.
Well, as i wrote it happend even with no-plugins setup. I assume, plugin could modify some entity to broken state and then it was saved corrupting the whole save?