diff --git a/server/lib/python/cartodb_services/cartodb_services/mapbox/isolines.py b/server/lib/python/cartodb_services/cartodb_services/mapbox/isolines.py
index 9c1eb07..4d6563f 100644
--- a/server/lib/python/cartodb_services/cartodb_services/mapbox/isolines.py
+++ b/server/lib/python/cartodb_services/cartodb_services/mapbox/isolines.py
@@ -162,7 +162,7 @@ class MapboxIsolines():
         # delete points that got None
         location_estimates_filtered = []
         for i, c in enumerate(costs):
-            if c < isorange * (1 + tolerance):
+            if c != isorange and c < isorange * (1 + tolerance):
                 location_estimates_filtered.append(destinations[i])
 
         return location_estimates_filtered