diff --git a/fgs/views.py b/fgs/views.py
index 162ad26..42f6049 100644
--- a/fgs/views.py
+++ b/fgs/views.py
@@ -48,8 +48,9 @@ def collars_distance():
   
         distance_kilometers = 0
         coords_pairs = list(map(lambda e : (e.longitude, e.latitude), coords))
+        if len(coord_pairs) < 1: continue
 
-        coord_last = coords_pairs.pop()
+        coord_last = coords_pairs.pop(0)
         for coord in coords_pairs:
             distance_kilometers += geopy.distance.VincentyDistance(coord_last,coord).km
             coord_last = coord