Try our best to ensure a shaders asset is assigned to the image effect component.

Assets/Scripts/Core/Fsr3UpscalerShaders.cs

@@ -72,11 +72,11 @@ namespace FidelityFX
 
         private static ComputeShader FindComputeShader(string name)
         {
-            string[] assets = UnityEditor.AssetDatabase.FindAssets($"t:ComputeShader {name}");
-            if (assets == null || assets.Length == 0)
+            string[] assetGuids = UnityEditor.AssetDatabase.FindAssets($"t:ComputeShader {name}");
+            if (assetGuids == null || assetGuids.Length == 0)
                 return null;
 
-            string assetPath = UnityEditor.AssetDatabase.GUIDToAssetPath(assets[0]);
+            string assetPath = UnityEditor.AssetDatabase.GUIDToAssetPath(assetGuids[0]);
             return UnityEditor.AssetDatabase.LoadAssetAtPath<ComputeShader>(assetPath);
         }
         #endif

Assets/Scripts/Fsr3UpscalerImageEffect.cs

@@ -147,6 +147,13 @@ namespace FidelityFX
                 return;
             }
             
+            if (shaders == null)
+            {
+                Debug.LogError($"FSR3 Upscaler shaders are not assigned! Please ensure an {nameof(Fsr3UpscalerShaders)} asset is assigned to the Shaders property of this component.");
+                enabled = false;
+                return;
+            }
+
             if (_maxRenderSize.x == 0 || _maxRenderSize.y == 0)
             {
                 Debug.LogError($"FSR3 Upscaler render size is invalid: {_maxRenderSize.x}x{_maxRenderSize.y}. Please check your screen resolution and camera viewport parameters.");
@@ -459,5 +466,20 @@ namespace FidelityFX
             
             return _maxRenderSize;
         }
+        
+        #if UNITY_EDITOR
+        private void Reset()
+        {
+            if (shaders != null)
+                return;
+
+            string[] assetGuids = UnityEditor.AssetDatabase.FindAssets($"t:{nameof(Fsr3UpscalerShaders)}");
+            if (assetGuids == null || assetGuids.Length == 0)
+                return;
+
+            string assetPath = UnityEditor.AssetDatabase.GUIDToAssetPath(assetGuids[0]);
+            shaders = UnityEditor.AssetDatabase.LoadAssetAtPath<Fsr3UpscalerShaders>(assetPath);
+        }
+        #endif
     }
 }