diff --git a/HISTORY.md b/HISTORY.md
index 79bbf04a..538c7188 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -12,7 +12,9 @@ http://visjs.org
 
 - Fixed #1441: Height of subgroups not immediately updated after updating
   data in a DataSet or DataView.
-  
+- Fixed #1491: Problem using ctrl+drag in combination with using a `DataView`,
+  and an issue with ctrl+drag when using `snap: null`.
+
 ### Graph2d
 
 - Implemented a new option for `shaded.orientation` to always shade towards zero.
diff --git a/lib/DataSet.js b/lib/DataSet.js
index f4ca42ec..f42ca848 100644
--- a/lib/DataSet.js
+++ b/lib/DataSet.js
@@ -357,7 +357,7 @@ DataSet.prototype.get = function (args) {
   if (id != undefined) {
     // return a single item
     item = me._getItem(id, type);
-    if (filter && !filter(item)) {
+    if (item && filter && !filter(item)) {
       item = null;
     }
   }
diff --git a/lib/timeline/component/ItemSet.js b/lib/timeline/component/ItemSet.js
index 4ec39bfb..edff2897 100644
--- a/lib/timeline/component/ItemSet.js
+++ b/lib/timeline/component/ItemSet.js
@@ -1248,7 +1248,7 @@ ItemSet.prototype._onDragStartAddItem = function (event) {
   var time = this.body.util.toTime(x);
   var scale = this.body.util.getScale();
   var step = this.body.util.getStep();
-  var start = snap ? snap(time, scale, step) : start;
+  var start = snap ? snap(time, scale, step) : time;
   var end = start;
 
   var itemData = {