diff --git a/public/js/pages/Calendar/View.js b/public/js/pages/Calendar/View.js
index 4924c0190..46e6847df 100644
--- a/public/js/pages/Calendar/View.js
+++ b/public/js/pages/Calendar/View.js
@@ -1114,7 +1114,7 @@ if (typeof (EventSource) !== 'undefined') {
     let jsondata;
     source.addEventListener('error', function (e) {
         let txt;
-        switch (Event.target.readyState) {
+        switch (e.target.readyState) {
             // if reconnecting
             case EventSource.CONNECTING:
                 txt = 'Reconnecting...';