app/assets/javascripts/highcharts/modules/export-data.js in highcharts-rails-6.0.2 vs app/assets/javascripts/highcharts/modules/export-data.js in highcharts-rails-6.0.3

@@ -1,7 +1,7 @@
 /**
- * @license Highcharts JS v6.0.2 (2017-10-20)
+ * @license Highcharts JS v6.0.3 (2017-11-14)
  * Exporting module
  *
  * (c) 2010-2017 Torstein Honsi
  *
  * License: www.highcharts.com/license
@@ -116,20 +116,18 @@
                 viewData: 'View data table'
             }
         });
 
         // Add an event listener to handle the showTable option
-        Highcharts.Chart.prototype.callbacks.push(function(chart) {
-            Highcharts.addEvent(chart, 'render', function() {
-                if (
-                    chart.options &&
-                    chart.options.exporting &&
-                    chart.options.exporting.showTable
-                ) {
-                    chart.viewData();
-                }
-            });
+        Highcharts.addEvent(Highcharts.Chart.prototype, 'render', function() {
+            if (
+                this.options &&
+                this.options.exporting &&
+                this.options.exporting.showTable
+            ) {
+                this.viewData();
+            }
         });
 
         // Set up key-to-axis bindings. This is used when the Y axis is datetime or 
         // categorized. For example in an arearange series, the low and high values
         // sholud be formatted according to the Y axis type, and in order to link them
@@ -451,10 +449,10 @@
                 blobObject,
                 name;
 
             if (this.options.exporting.filename) {
                 name = this.options.exporting.filename;
-            } else if (this.title) {
+            } else if (this.title && this.title.textStr) {
                 name = this.title.textStr.replace(/ /g, '-').toLowerCase();
             } else {
                 name = 'chart';
             }