kurotori
VRCSDK 3.7.5
Steps to Reproduce:
  1. Attach the VRC Enable Persistence component and VRC Player Object component to an object.
  2. Attach the following UdonSharp script to the same object.
  3. Execute Interact() in ClientSim.
---
using UdonSharp;
using UnityEngine;
using VRC.SDKBase;
using VRC.Udon;
[UdonBehaviourSyncMode(BehaviourSyncMode.Manual)]
public class VRCURLPersistenceTest : UdonSharpBehaviour
{
[UdonSynced]
private VRCUrl testUrl;
public override void Interact()
{
RequestSerialization();
}
}
---
Observed Error:
When running the script in ClientSim, the following NullReferenceException occurs:
---
NullReferenceException: Object reference not set to an instance of an object
VRC.SDK3.ClientSim.Editor.VisualElements.Fields.FieldFactory.GenerateField[T] (System.String fieldName, T data) (at ./Packages/com.vrchat.worlds/Integrations/ClientSim/Editor/VisualElements/Fields/FieldFactory.cs:79)
VRC.SDK3.ClientSim.Editor.VisualElements.EncodeDecodeEditors.ClientSimUdonEncodeDecodeEditor.GenerateFields (UnityEngine.MonoBehaviour component, VRC.SDK3.Data.DataDictionary data) (at ./Packages/com.vrchat.worlds/Integrations/ClientSim/Editor/VisualElements/EncodeDecodeEditors/ClientSimUdonEncodeDecodeEditor.cs:30)
VRC.SDK3.ClientSim.Editor.VisualElements.ClientSimNetworkHolderInstanceElement.GenerateDataElements (System.Int32 index) (at ./Packages/com.vrchat.worlds/Integrations/ClientSim/Editor/VisualElements/ClientSimNetworkHolderInstanceElement.cs:72)
VRC.SDK3.ClientSim.Editor.VisualElements.ClientSimNetworkHolderInstanceElement.UpdateData (VRC.SDK3.ClientSim.Editor.ClientSimPlayerObjectWindow+PlayerObjectData data) (at ./Packages/com.vrchat.worlds/Integrations/ClientSim/Editor/VisualElements/ClientSimNetworkHolderInstanceElement.cs:94)
VRC.SDK3.ClientSim.Editor.ClientSimPlayerObjectWindow.UpdateCurrentPage (VRC.SDK3.ClientSim.ClientSimOnPlayerObjectUpdateEndedEvent e) (at ./Packages/com.vrchat.worlds/Integrations/ClientSim/Editor/Windows/ClientSimPlayerObjectWindow.cs:259)
VRC.SDK3.ClientSim.ClientSimEventDispatcher.SendEvent[T] (T clientSimEvent) (at ./Packages/com.vrchat.worlds/Integrations/ClientSim/Runtime/Events/ClientSimEventDispatcher.cs:62)
VRC.SDK3.ClientSim.Persistence.ClientSimPlayerObjectStorage.LateUpdate () (at ./Packages/com.vrchat.worlds/Integrations/ClientSim/Runtime/Player/PlayerPersistence/ClientSimPlayerObjectStorage.cs:172)
---
Workaround:
Setting an initial value for the synced VRCUrl variable prevents the error:
---
[UdonSynced]
private VRCUrl testUrl = VRCUrl.Empty;
---
Possible Cause & Suggestion:
It seems that ClientSim does not handle null values properly when processing synced variables. Adding proper null handling for synced variables, especially for VRCUrl, may help prevent this error.