Bug Unity Crashes on Rpc call

Hi all, I was trying to create generic class for serializing a list of INetworkSerializable items, but unexpectedly unity crashes (version 2021.2.14f1) on the server-side when calling client RPC from the server.
Class itself:

Code (CSharp):

1.     public class ListSerializable<U>: INetworkSerializable where U : INetworkSerializable
2.     {
3.         public U[] Source { get; set; }
4.         public void NetworkSerialize<T>(BufferSerializer<T> serializer) where T : IReaderWriter
5.         {
6.             int length = 0;
7.             if (!serializer.IsReader)
8.             {
9.                 length = Source.Length;
10.             }
11.  
12.             serializer.SerializeValue(ref length);
13.  
14.             if (serializer.IsReader && Source == null)
15.             {
16.                 Source = new U[length];
17.             }
18.             for (int i = 0; i < length; i++)
19.             {
20.                 Source[i].NetworkSerialize(serializer);
21.             }
22.         }
23.     }

Here unity crashes, on line 18:

Code (CSharp):

1.         [ServerRpc(RequireOwnership = false)]
2.         private void GetAllProfilesServerRpc(ulong clientId)
3.         {
4.             if (!IsServer)
5.             {
6.                 return;
7.             }
8.             var profiles = ServerGameManager.ConnectedPlayers;
9.             var serializableProfiles = new ListSerializable<ServerPlayerProfile>() { Source = profiles.ToArray() };
10.             Debug.Log($"Sending all profiles to client {clientId}");
11.             ClientRpcParams clientRpcParams = new ClientRpcParams
12.             {
13.                 Send = new ClientRpcSendParams
14.                 {
15.                     TargetClientIds = new ulong[] { clientId }
16.                 }
17.             };
18.             GetAllProfilesClientRpc(serializableProfiles, clientRpcParams);
19.         }

When I replaced the generic part in the class with a specific one it's stops crashing.

 

It may help to know the error and if it's on the client or server side, but I would hazard a guess the reader doesn't know how to deserialize generic types. Objects that share the same interface have the same problem and a separate value is needed to identify the object type. I've not tried generic types though so I could be wrong.

 

Generic types are currently not supported in RPCs and crash the process currently when used. We're aware of this and are working on a fix.

 

Ok, thanks, good to know.