After updating the plugin and a server restart i got: 

Error loading save (server/my_server_identity/FebruDunn.281.sav)
MissingFieldException: Field not found: int ProtoBuf.Item.reserved_int_0 Due to: Could not find field in class
at ItemContainer.Load (ProtoBuf.ItemContainer container) [0x001a4] in <2882c7c2a95a4586ac6f9f288b265589>:0
at ContainerIOEntity.Load (BaseNetworkable+LoadInfo info) [0x00024] in <2882c7c2a95a4586ac6f9f288b265589>:0
at VendingMachine.Load (BaseNetworkable+LoadInfo info) [0x00000] in <2882c7c2a95a4586ac6f9f288b265589>:0
at NPCVendingMachine.Load (BaseNetworkable+LoadInfo info) [0x000d0] in <2882c7c2a95a4586ac6f9f288b265589>:0
at InvisibleVendingMachine.Load (BaseNetworkable+LoadInfo info) [0x00000] in <2882c7c2a95a4586ac6f9f288b265589>: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__22:MoveNext()
and corrupted the save.

all vending machines and vending npcs were gone after another restart, had to completely wipe the server. 

I'm not aware of anything in the latest version of the plugin which could cause that. I will see if I can reproduce it. Any more info you can provide, such as how you had configured your vending machines, may be of use.

i didnt change anything for the deep sea, and i also didnt have the latest #5 hotfix applied to the server yet before updating. im thinking something may have gotten borked there.

o.reload CustomVendingSetup
[CSharp] Started Oxide.Compiler v successfully
CustomVendingSetup was compiled successfully in 2099ms
Unloaded plugin Custom Vending Setup v2.15.0 by WhiteThunder
Loaded plugin Custom Vending Setup v2.15.0 by WhiteThunder

me too

(13:08:42) | CustomVendingSetup was compiled successfully in 271ms
(13:08:42) | Unloaded plugin Custom Vending Setup v2.14.6 by WhiteThunder
(13:08:42) | Loaded plugin Custom Vending Setup v2.15.0 by WhiteThunder
(13:08:42) | Unloaded plugin Custom Vending Setup v2.15.0 by WhiteThunder
(13:08:42) | Loaded plugin Custom Vending Setup v2.15.0 by WhiteThunder​