Fix undefined variable (#6698)

diff --git a/src/core/core.scale.js b/src/core/core.scale.js
index 914bdefaae1ae0a93442768fcffaa14568fad805..0c1413d4a0398ac2c126c8f63acb63bda9f8c412 100644 (file)
--- a/src/core/core.scale.js
+++ b/src/core/core.scale.js
@@ -356,7 +356,7 @@ var Scale = Element.extend({
        */
        _getLabels: function() {
                var data = this.chart.data;
-               return this.options.labels || (this.isHorizontal() ? data.xLabels : data.yLabels) || data.labels;
+               return this.options.labels || (this.isHorizontal() ? data.xLabels : data.yLabels) || data.labels || [];
        },
 
        // These methods are ordered by lifecyle. Utilities then follow.