diff --git a/src/loaders/JSONLoader.js b/src/loaders/JSONLoader.js
index ccc1666a11ff595254c2dd2963ef24c7da9dd9a4..61a32e9bafa3c71c0b6557c4788809ac196d04a1 100644
--- a/src/loaders/JSONLoader.js
+++ b/src/loaders/JSONLoader.js
@@ -419,17 +419,22 @@ THREE.JSONLoader.prototype.parse = function ( json, texturePath ) {
 
 	};
 
-	var materials = this.initMaterials( json.materials, texturePath );
+	if ( json.materials === undefined ) {
 
-	if ( this.needsTangents( materials ) ) {
+		return { geometry: geometry };
 
-		geometry.computeTangents();
+	} else {
 
-	}
+		var materials = this.initMaterials( json.materials, texturePath );
 
-	return {
-		geometry: geometry,
-		materials: materials
-	};
+		if ( this.needsTangents( materials ) ) {
+
+			geometry.computeTangents();
+
+		}
+
+		return { geometry: geometry, materials: materials };
+
+	}
 
 };