fixes #17716, sporadic gesture/tap error

dojo · Feb 24, 2017 · 2c8df0f · 2c8df0f
1 parent cc13d35
commit 2c8df0f
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/gesture/tap.js b/gesture/tap.js
@@ -129,6 +129,9 @@ var clz = declare(/*===== "dojox.gesture.tap", =====*/Base, {
 	_isTap: function(/*Object*/data, /*Event*/e){
 		// summary:
 		//		Check whether it's an valid tap
+		if (!data.context) {
+			return false;
+		}
 		var dx = Math.abs(data.context.x - e.screenX);
 		var dy = Math.abs(data.context.y - e.screenY);
 		return dx <= this.tapRadius && dy <= this.tapRadius;
@@ -142,4 +145,4 @@ dojox.gesture.tap.Tap = clz;
 
 return dojox.gesture.tap;
 
-});
+});