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Assets/Photon/PhotonUnityNetworking/UtilityScripts/UI/EventSystemSpawner.cs

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+// --------------------------------------------------------------------------------------------------------------------
+// <copyright file="EventSystemSpawner.cs" company="Exit Games GmbH">
+// </copyright>
+// <summary>
+// For additive Scene Loading context, eventSystem can't be added to each scene and instead should be instantiated only if necessary.
+// https://answers.unity.com/questions/1403002/multiple-eventsystem-in-scene-this-is-not-supporte.html
+// </summary>
+// <author>developer@exitgames.com</author>
+// --------------------------------------------------------------------------------------------------------------------
+
+using UnityEngine;
+using UnityEngine.EventSystems;
+
+namespace Photon.Pun.UtilityScripts
+{
+    /// <summary>
+    /// Event system spawner. Will add an EventSystem GameObject with an EventSystem component and a StandaloneInputModule component.
+    /// Use this in additive scene loading context where you would otherwise get a "Multiple EventSystem in scene... this is not supported" error from Unity.
+    /// </summary>
+    public class EventSystemSpawner : MonoBehaviour
+    {
+        void OnEnable()
+        {
+            #if ENABLE_INPUT_SYSTEM && !ENABLE_LEGACY_INPUT_MANAGER
+            Debug.LogError("PUN Demos are not compatible with the New Input System, unless you enable \"Both\" in: Edit > Project Settings > Player > Active Input Handling. Pausing App.");
+            Debug.Break();
+            return;
+            #endif
+
+            EventSystem sceneEventSystem = FindObjectOfType<EventSystem>();
+            if (sceneEventSystem == null)
+            {
+                GameObject eventSystem = new GameObject("EventSystem");
+
+                eventSystem.AddComponent<EventSystem>();
+                eventSystem.AddComponent<StandaloneInputModule>();
+            }
+        }
+    }
+}