diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderSeparator/SkeletonRenderSeparator.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderSeparator/SkeletonRenderSeparator.cs
index af83f6d34..627647599 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderSeparator/SkeletonRenderSeparator.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderSeparator/SkeletonRenderSeparator.cs
@@ -30,6 +30,11 @@
 #if UNITY_2018_3 || UNITY_2019 || UNITY_2018_3_OR_NEWER
 #define NEW_PREFAB_SYSTEM
 #endif
+
+#if UNITY_2018_1_OR_NEWER
+#define HAS_PROPERTY_BLOCK_QUERY
+#endif
+
 #define SPINE_OPTIONAL_RENDEROVERRIDE
 
 using System.Collections.Generic;
@@ -207,7 +212,12 @@ namespace Spine.Unity {
 			int rendererCount = partsRenderers.Count;
 			if (rendererCount <= 0) return;
 
-			if (copyPropertyBlock)
+#if HAS_PROPERTY_BLOCK_QUERY
+			bool assignPropertyBlock = this.copyPropertyBlock && mainMeshRenderer.HasPropertyBlock();
+#else
+			bool assignPropertyBlock = this.copyPropertyBlock;
+#endif
+			if (assignPropertyBlock)
 				mainMeshRenderer.GetPropertyBlock(copiedBlock);
 
 			MeshGenerator.Settings settings = new MeshGenerator.Settings {
@@ -234,9 +244,8 @@ namespace Spine.Unity {
 					MeshGenerator meshGenerator = currentRenderer.MeshGenerator;
 					meshGenerator.settings = settings;
 
-					if (copyPropertyBlock)
+					if (assignPropertyBlock)
 						currentRenderer.SetPropertyBlock(copiedBlock);
-
 					// Render
 					currentRenderer.RenderParts(instruction.submeshInstructions, start, si + 1);
 
diff --git a/spine-unity/Assets/Spine/package.json b/spine-unity/Assets/Spine/package.json
index 4091c3c47..a67fa0dfb 100644
--- a/spine-unity/Assets/Spine/package.json
+++ b/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": "4.2.19",
+	"version": "4.2.20",
 	"unity": "2018.3",
 	"author": {
 		"name": "Esoteric Software",