Fixed a regression: Timeline/Graph2d constructor throwing an exception when no options are provided via the constructor

HISTORY.md

@@ -4,6 +4,16 @@ http://visjs.org
 
 ## not yet released, version 4.13.1-SNAPSHOT
 
+### Timeline
+
+- Fixed a regression: Timeline/Graph2d constructor throwing an exception when
+  no options are provided via the constructor.
+
+### Graph2d
+
+- Fixed a regression: Timeline/Graph2d constructor throwing an exception when
+  no options are provided via the constructor.
+
 ### Graph3d
 
 - Fixed #1615: implemented new option `dotSizeRatio`.

lib/timeline/Core.js

@@ -29,7 +29,6 @@ Emitter(Core.prototype);
  */
 Core.prototype._create = function (container) {
   this.dom = {};
-  this.options = {};
 
   this.dom.container = container;