[unity] Added null check at SkeletonRenderSeparator, closes #2823.

spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderSeparator/SkeletonRenderSeparator.cs

@@ -212,6 +212,7 @@ namespace Spine.Unity {
 		}
 
 		public void UpdateVisibility () {
+			if (skeletonRenderer == null) return;
 			foreach (SkeletonPartsRenderer partsRenderer in partsRenderers) {
 				if (partsRenderer == null) continue;
 

spine-unity/Assets/Spine/package.json

@@ -2,7 +2,7 @@
 	"name": "com.esotericsoftware.spine.spine-unity",
 	"displayName": "spine-unity Runtime",
 	"description": "This plugin provides the spine-unity runtime core.",
-	"version": "4.2.101",
+	"version": "4.2.102",
 	"unity": "2018.3",
 	"author": {
 		"name": "Esoteric Software",