diff --git a/app-drawer/app-drawer.js b/app-drawer/app-drawer.js
index 0bf930b1..6e3db621 100644
--- a/app-drawer/app-drawer.js
+++ b/app-drawer/app-drawer.js
@@ -368,6 +368,11 @@ Polymer({
   },
 
   _trackMove: function(event) {
+    if (!this._trackDetails) {
+      // Ignore any "track" events which occur before "start".
+      return;
+    }
+
     this._translateDrawer(event.detail.dx + this._translateOffset);
 
     // Use Date.now() since event.timeStamp is inconsistent across browsers
@@ -376,6 +381,11 @@ Polymer({
   },
 
   _trackEnd: function(event) {
+    if (!this._trackDetails) {
+      // Ignore any "track" events which occur before "start".
+      return;
+    }
+
     var x = event.detail.dx + this._translateOffset;
     var drawerWidth = this.getWidth();
     var isPositionLeft = this.position === 'left';