hotfix

skais/ais/ais_trajectory.py

@@ -88,7 +88,7 @@ def __get_bounding_box__(bounding_box, positions, ref_index):
         upper_lon = center_lon + distance_to_center
         lower_lon = center_lon - distance_to_center
     elif type(bounding_box) is list:
-        if type(bounding_box[0]) is not numbers.Number:
+        if isinstance(bounding_box[0], numbers.Number):
             upper_lon = bounding_box[1][0]
             lower_lon = bounding_box[0][0]
             upper_lat = bounding_box[1][1]