diff --git a/Interface.py b/Interface.py
index 5bd4ab6f410fe355a76cc519529ea89ac3848525..4a3ca83c39bf2088eec738f95492883036d3ca20 100644
--- a/Interface.py
+++ b/Interface.py
@@ -79,7 +79,10 @@ class HydroOverlap :
 #
     def __init__(self, nbpt, nbvmax, sub_pts, sub_index_in, sub_area_in, sub_lon_in, sub_lat_in, sub_hdom_in, part, modelgrid, hydrodata) :
         #
-        print("np.shape(sub_hdom_in)", np.shape(sub_hdom_in))
+        if isinstance(sub_hdom_in, list) :
+            print("len(sub_hdom_in)", len(sub_hdom_in))
+        else :
+            print("np.shape(sub_hdom_in)", np.shape(sub_hdom_in))
         #
         # Reshape stuff so that it fits into arrays
         #