diff --git a/server/DeviceServer.js b/server/DeviceServer.js
index 415fb10..6af8301 100755
--- a/server/DeviceServer.js
+++ b/server/DeviceServer.js
@@ -265,7 +265,7 @@ DeviceServer.prototype = {
                             logger.log("Session ended for " + core._connection_key);
                             delete _cores[key];
                             
-                            /* offline */
+                            var coreid = this.getHexCoreID();
                             if (global.online_devices == undefined) global.online_devices = {};
                             else delete global.online_devices[coreid];