diff --git a/package.json b/package.json
index 55b0416..fc1adbd 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,7 @@
         "cgi": "0.3.1",
         "compression": "^1.7.4",
         "express": "^4.16.4",
-        "sockjs": "^0.3.19"
+        "sockjs": "~0.3.20"
     },
     "repository": {
         "type": "git",
diff --git a/worldmap/worldmap.js b/worldmap/worldmap.js
index 42f11fc..25a6258 100644
--- a/worldmap/worldmap.js
+++ b/worldmap/worldmap.js
@@ -1572,6 +1572,9 @@ function setMarker(data) {
     if (data.dashArray) { delete data.dashArray; }
     if (data.fill) { delete data.fill; }
     if (data.draggable) { delete data.draggable; }
+    if (data.hasOwnProperty("clickable")) { delete data.clickable; }
+    if (data.hasOwnProperty("fillColor")) { delete data.fillColor; }
+    if (data.hasOwnProperty("radius")) { delete data.radius; }
     for (var i in data) {
         if ((i != "name") && (i != "length")) {
             if (typeof data[i] === "object") {