diff --git a/data/interfaces/default/graphs.html b/data/interfaces/default/graphs.html
index 6f30fa6c..edb76a5a 100644
--- a/data/interfaces/default/graphs.html
+++ b/data/interfaces/default/graphs.html
@@ -281,7 +281,7 @@
function getGraphVisibility(chart_name, data_series) {
var chart_key = 'HighCharts_' + chart_name;
- var chart_visibility = JSON.parse(getLocalStorage(chart_key)) || [];
+ var chart_visibility = JSON.parse(getLocalStorage(chart_key, null)) || [];
chart_visibility = chart_visibility.reduce(function(obj, s) {
obj[s.name] = s.visible;