diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Windows/SpinePreferences.cs b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Windows/SpinePreferences.cs
index a8469d22d..c838b9ffe 100644
--- a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Windows/SpinePreferences.cs
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Windows/SpinePreferences.cs
@@ -236,7 +236,9 @@ namespace Spine.Unity.Editor {
 					if (string.IsNullOrEmpty(textureSettingsRef.stringValue)) {
 						var pmaTextureSettingsReferenceGUIDS = AssetDatabase.FindAssets("PMATexturePreset");
 						if (pmaTextureSettingsReferenceGUIDS.Length > 0) {
-							textureSettingsRef.stringValue = AssetDatabase.GUIDToAssetPath(pmaTextureSettingsReferenceGUIDS[0]);
+							var assetPath = AssetDatabase.GUIDToAssetPath(pmaTextureSettingsReferenceGUIDS[0]);
+							if (!string.IsNullOrEmpty(assetPath))
+								textureSettingsRef.stringValue = assetPath;
 						}
 					}
 
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Mesh Generation/MeshGenerator.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Mesh Generation/MeshGenerator.cs
index 27a2f0eaa..1b1df877e 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Mesh Generation/MeshGenerator.cs	
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Mesh Generation/MeshGenerator.cs	
@@ -27,6 +27,10 @@
  * THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/
 
+#if UNITY_2019_3_OR_NEWER
+#define MESH_SET_TRIANGLES_PROVIDES_LENGTH_PARAM
+#endif
+
 // Not for optimization. Do not disable.
 #define SPINE_TRIANGLECHECK // Avoid calling SetTriangles at the cost of checking for mesh differences (vertex counts, memberwise attachment list compare) every frame.
 //#define SPINE_DEBUG
@@ -1117,7 +1121,11 @@ namespace Spine.Unity {
 			mesh.subMeshCount = submeshCount;
 
 			for (int i = 0; i < submeshCount; i++)
+#if MESH_SET_TRIANGLES_PROVIDES_LENGTH_PARAM
+				mesh.SetTriangles(submeshesItems[i].Items, 0, submeshesItems[i].Count, i, false);
+#else
 				mesh.SetTriangles(submeshesItems[i].Items, i, false);
+#endif
 		}
 		#endregion