diff --git a/ki/handlers/update_profile.py b/ki/handlers/update_profile.py
index 8fd0d9e..884543d 100644
--- a/ki/handlers/update_profile.py
+++ b/ki/handlers/update_profile.py
@@ -150,7 +150,7 @@ def update_profile(user_id: int):
     try:
         availability_hours_per_week = int(availability_hours_per_week_raw)
     except:
-        availability_hours_per_week = 0
+        availability_hours_per_week = None
 
     profile.availability_hours_per_week = availability_hours_per_week