Update map_handler.py

map_handler.py

@@ -32,6 +32,6 @@ class MapHandler:
 
     def clear_markers(self, map_object):
         """Clear all markers from the map."""
-        for layer in list(map_object._children.values()):
-            if isinstance(layer, folium.Marker):
-                map_object.remove_child(layer)
+        for name in list(map_object._children.keys()):
+            if name.startswith('marker_'):
+                del map_object._children[name]