diff --git a/htdocs/map.js b/htdocs/map.js
index 20d18c1..41c1105 100644
--- a/htdocs/map.js
+++ b/htdocs/map.js
@@ -88,7 +88,7 @@
     }
 
     var processUpdates = function(updates) {
-        if (!map) {
+        if (typeof(AprsMarker) == 'undefined') {
             updateQueue = updateQueue.concat(updates);
             return;
         }