Prevent spare datasets from breaking MultiTooltips

diff --git a/src/Chart.Core.js b/src/Chart.Core.js
index fbec59c30722a5406a2b787b8a763d8410239029..0bd5da26877c6fe615821a97ee3017a74fc7ad04 100755 (executable)
--- a/src/Chart.Core.js
+++ b/src/Chart.Core.js
@@ -873,7 +873,9 @@
                                                                yMin;
                                                        helpers.each(this.datasets, function(dataset){
                                                                dataCollection = dataset.points || dataset.bars || dataset.segments;
-                                                               Elements.push(dataCollection[dataIndex]);
+                                                               if (dataCollection[dataIndex]){
+                                                                       Elements.push(dataCollection[dataIndex]);
+                                                               }
                                                        });
 
                                                        helpers.each(Elements, function(element) {