syncvar causes IndexOutOfRangeException: NetworkReader:ReadByte out of range:NetBuf

Multiplayer & Networking
1

When I use a syncvar on a script attached to player, I get the following error:

IndexOutOfRangeException: NetworkReader:ReadByte out of range:NetBuf sz:3 pos:3
UnityEngine.Networking.NetBuffer.ReadByte () (at C:/buildslave/unity/build/Extensions/Networking/Runtime/NetworkBuffer.cs:36)
UnityEngine.Networking.NetworkReader.ReadUInt16 () (at C:/buildslave/unity/build/Extensions/Networking/Runtime/NetworkReader.cs:187)
UnityEngine.Networking.NetworkReader.ReadString () (at C:/buildslave/unity/build/Extensions/Networking/Runtime/NetworkReader.cs:297)
networkData.OnDeserialize (UnityEngine.Networking.NetworkReader reader, Boolean initialState)
UnityEngine.Networking.NetworkIdentity.OnUpdateVars (UnityEngine.Networking.NetworkReader reader, Boolean initialState) (at C:/buildslave/unity/build/Extensions/Networking/Runtime/NetworkIdentity.cs:749)
UnityEngine.Networking.ClientScene.ApplySpawnPayload (UnityEngine.Networking.NetworkIdentity uv, Vector3 position, System.Byte[] payload, NetworkInstanceId netId, UnityEngine.GameObject newGameObject) (at C:/buildslave/unity/build/Extensions/Networking/Runtime/ClientScene.cs:496)
UnityEngine.Networking.ClientScene.OnObjectSpawnScene (UnityEngine.Networking.NetworkMessage netMsg) (at C:/buildslave/unity/build/Extensions/Networking/Runtime/ClientScene.cs:614)
UnityEngine.Networking.NetworkConnection.HandleReader (UnityEngine.Networking.NetworkReader reader, Int32 receivedSize, Int32 channelId) (at C:/buildslave/unity/build/Extensions/Networking/Runtime/NetworkConnection.cs:468)
UnityEngine.Networking.NetworkConnection.HandleBytes (System.Byte[] buffer, Int32 receivedSize, Int32 channelId) (at C:/buildslave/unity/build/Extensions/Networking/Runtime/NetworkConnection.cs:424)
UnityEngine.Networking.NetworkConnection.TransportRecieve (System.Byte[] bytes, Int32 numBytes, Int32 channelId) (at C:/buildslave/unity/build/Extensions/Networking/Runtime/NetworkConnection.cs:576)
UnityEngine.Networking.NetworkClient.Update () (at C:/buildslave/unity/build/Extensions/Networking/Runtime/NetworkClient.cs:735)
UnityEngine.Networking.NetworkClient.UpdateClients () (at C:/buildslave/unity/build/Extensions/Networking/Runtime/NetworkClient.cs:950)
UnityEngine.Networking.NetworkIdentity.UNetStaticUpdate () (at C:/buildslave/unity/build/Extensions/Networking/Runtime/NetworkIdentity.cs:1089)

It was working fine before, I just can’t find out whats causing it.
Im using latest version, 5.5.1, both client and host have the same build.

2

problem solved, I had the player prefab present in scene, which caused a synchronization problem.