doubling invisible markers

app.py

@@ -134,8 +134,9 @@ def generate_static_map(geojson_data, bounds=None):
     if not geojson_data["features"]:
         # Add a small invisible marker to prevent rendering error
         #log marker
-        logging.info(f"Adding invisible marker to {center_lat, center_lng}")
-        m.add_marker(CircleMarker((center_lat, center_lng), '#FFFFFF', 0))  # White marker with size 0
+        logging.info(f"Adding invisible marker to {bounds[0], bounds[1]}")
+        m.add_marker(CircleMarker(tuple(bounds[0]), '#FFFFFF', 0))  # White marker with size 0
+        m.add_marker(CircleMarker(tuple(bounds[1]), '#FFFFFF', 0))  # White marker with size 0
         return m.render()
 
     # Process each feature in the GeoJSON