diff --git a/backend/core/models.py b/backend/core/models.py
index abc4048ae..f3c9f2f24 100644
--- a/backend/core/models.py
+++ b/backend/core/models.py
@@ -1660,7 +1660,7 @@ def get_ranking_score(self):
             if current >= 0 and residual >= 0:
                 value += (1 + current - residual) * (current + 1)
         return (
-            abs(round(value / self.MAP_EFFORT[self.effort], 4)) if self.effort else None
+            abs(round(value / self.MAP_EFFORT[self.effort], 4)) if self.effort else 0
         )
 
     @property