diff --git a/ultron/people/views.py b/ultron/people/views.py
index d8fa80f7aa..cac38923ec 100644
--- a/ultron/people/views.py
+++ b/ultron/people/views.py
@@ -75,7 +75,12 @@ def gymnast_details(request, gymnast_id, tab=None):
     nb_known_skill = (
         LearnedSkill.objects.filter(gymnast=gymnast_id).distinct("skill").count()
     )
-    percentage_known_skill = (nb_known_skill / nb_skill) * 100
+
+    if nb_skill != 0:
+        percentage_known_skill = (nb_known_skill / nb_skill) * 100
+    else:
+        percentage_known_skill = 0
+
     chronos_list = Chrono.objects.filter(gymnast=gymnast_id).order_by("-date")[:10]
     straightjump_score = (
         Chrono.objects.filter(gymnast=gymnast_id)