Bug ArgumentException: The Object you want to instantiate is null.

I am baking link to monobehaviour prefab in this component:

Code (CSharp):

1. public class Phantom : IComponentData
2. {
3.     public VRIKSource VRIKSourcePrefab;
4. }
5.  
6. public class VRIKSource : MonoBehaviour {....}

This is authoring class:

Code (CSharp):

1. public class PhantomAuthoring : MonoBehaviour
2. {
3.     public VRIKSource VRIKSource;
4.  
5.     class Baker : Baker<PhantomAuthoring>
6.     {
7.         public override void Bake(PhantomAuthoring authoring)
8.         {
9.             AddComponentObject(new Phantom() {VRIKSourcePrefab = authoring.VRIKSource});
10.  
11.             AddBuffer<PhantomCommandData>();
12.             var buffer = AddBuffer<PhantomBone>();
13.             buffer.Length = authoring.VRIKSource.Bones.Length;
14.         }
15.     }
16. }

Everything works ok in editor, but when i build dedicated server build I get ArgumentException: The Object you want to instantiate is null. On this line of code:

Code (CSharp):

1. foreach (var (phantom, phantomEntity) in SystemAPI.Query<Phantom>().WithNone<VRIKSolver>().WithEntityAccess())
2. {
3.     var vrikSource = Object.Instantiate(phantom.VRIKSourcePrefab);
4.     ...
5. }

Where is my prefab in build?