diff --git a/backend/core/models.py b/backend/core/models.py
index abc4048ae..2421f0d07 100644
--- a/backend/core/models.py
+++ b/backend/core/models.py
@@ -1659,9 +1659,7 @@ def get_ranking_score(self):
             residual = risk_scenario.residual_level
             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
-        )
+        return abs(round(value / self.MAP_EFFORT[self.effort], 4)) if self.effort else 0
 
     @property
     def get_html_url(self):