X-Git-Url: https://adrianiainlam.tk/git/?a=blobdiff_plain;ds=inline;f=dygraph.js;h=1ebe2613a7f518408887ca788e37d59e07461f64;hb=da1c187b3c86d2b906280c35de7ff9f744d1c000;hp=e1cdd4edbd0ae750b325dab3e9be4880fa97f581;hpb=c12450f169e3d58875caf967f87c0f9d9d314dba;p=dygraphs.git

diff --git a/dygraph.js b/dygraph.js
index e1cdd4e..1ebe261 100644
--- a/dygraph.js
+++ b/dygraph.js
@@ -483,11 +483,13 @@ Dygraph.prototype.cascadeEvents_ = function(name, extra_props) {
   Dygraph.update(e, extra_props);
 
   var callback_plugin_pairs = this.eventListeners_[name];
-  for (var i = callback_plugin_pairs.length - 1; i >= 0; i--) {
-    var plugin = callback_plugin_pairs[i][0];
-    var callback = callback_plugin_pairs[i][1];
-    callback.call(plugin, e);
-    if (e.propagationStopped) break;
+  if (callback_plugin_pairs) {
+    for (var i = callback_plugin_pairs.length - 1; i >= 0; i--) {
+      var plugin = callback_plugin_pairs[i][0];
+      var callback = callback_plugin_pairs[i][1];
+      callback.call(plugin, e);
+      if (e.propagationStopped) break;
+    }
   }
   return e.defaultPrevented;
 };