diff --git a/hosts/containers/sdrweb/adsb.html b/hosts/containers/sdrweb/adsb.html
index 87bee301..53c9fb38 100644
--- a/hosts/containers/sdrweb/adsb.html
+++ b/hosts/containers/sdrweb/adsb.html
@@ -126,7 +126,8 @@
                      if (Planes[plane.hex]) {
                          var myplane = Planes[plane.hex];
                          marker = myplane.marker;
-                         marker.setLatLng([plane.lat,plane.lon]);
+                         if (plane.lat && plane.lon)
+                             marker.setLatLng([plane.lat,plane.lon]);
                          marker.setIcon(getIconForPlane(plane));
                          myplane.altitude = plane.altitude;
                          myplane.speed = plane.speed;