diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderer.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderer.cs
index 307ffd8c9..1051f16cd 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderer.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderer.cs
@@ -480,7 +480,7 @@ namespace Spine.Unity {
 		private void AssignSpriteMaskMaterials()
 		{
 			#if UNITY_EDITOR
-			if (!Application.isPlaying) {
+			if (!Application.isPlaying && !UnityEditor.EditorApplication.isUpdating) {
 				EditorFixStencilCompParameters();
 			}
 			#endif