I saw players complaining about lag and now my console is being spammed with this

NullReferenceException: Object reference not set to an instance of an object

What does it mean?

(14:17:51) | Major fuckup! RelationshipManager spawned twice, Contact Developers!
(14:17:52) | NullReferenceException: Object reference not set to an instance of an object

I think I found the error and it was my old fault

I tried spawning the cargo ship to see if it was ingame yet. But it contained the word "ship" which meant I spawned the relationshipmanager (whatever it is twice)

so this error was caused by myself, so in case anyone else is wondering: be careful with what you spawn

luckely a server restart fixed it.