diff --git a/matrix-util.js b/matrix-util.js
index 9082a82..1a54af6 100644
--- a/matrix-util.js
+++ b/matrix-util.js
@@ -47,9 +47,9 @@ MatrixUtil.prototype.updateBuddyState = function(jid, state, statusText, resourc
         lastUpdate: moment().format('YYYY-MM-DD HH:mm:ss')
     }
 
-    if (resource != 'undefined' && matrix.buddies[jid].resources.undefined) {
+    if (resource != 'undefined' && matrix.buddies[jid].resources['undefined']) {
         try {
-            delete matrix.buddies[jid].resources.undefined;
+            delete matrix.buddies[jid].resources.['undefined'];
         }
         catch(e) {};
     }