NullReferenceException on server start

I just changed my server config for my rust server. After I saved the config (at my rust server host panel) the server automatically restarted but didn’t come up.

I checked the logs and saw the following things:

Everything was fine, the server was loading everything but suddenly stopped, the last lines were:

[2/21/2016 5:51:26 PM]  - deleting 73 objects
[2/21/2016 5:51:26 PM] Map Spawned 19938 entities
[2/21/2016 5:51:27 PM] Stability Warmup
[2/21/2016 5:51:27 PM] 	1621 entities found
[2/21/2016 5:51:27 PM] Initializing Supports
[2/21/2016 5:51:28 PM] Initializing Stability
[2/21/2016 5:51:28 PM] Processing Queue
[2/21/2016 6:01:53 PM] Saved 18,197 ents, serialization(0.09), write(0.10), disk(0.00) totalstall(26.39).
[2/21/2016 6:01:53 PM] Saving complete

Then I checked the exceptions and saw:

[2/21/2016 5:51:28 PM] NullReferenceException
BaseEntity.Save (.SaveInfo info)
TreeEntity.Save (.SaveInfo info)
BaseNetworkable.ToStream (System.IO.Stream stream, .SaveInfo saveInfo)
BaseNetworkable.GetSaveCache ()
SaveRestore.GetSaveCache ()
Bootstrap+<StartServer>c__Iterator9.MoveNext ()

How can I fix this without wiping all the data?