so when im doing oil rig on my server it crashes and says this 
An exception was thrown! (NullReferenceException: Object reference not set to an instance of an object) at AttackEntity.HasAttackCooldown () [0x00005] in <5ba1d4536658475998daa468484da8f2>:0 at BaseProjectile.ServerUse (System.Single damageModifier, UnityEngine.Transform originOverride) [0x00009] in <5ba1d4536658475998daa468484da8f2>:0

Update Rust and Oxide; you're about 6 or so builds outdated with Oxide.