diff --git a/ennstatus/api/model.py b/ennstatus/api/model.py
--- a/ennstatus/api/model.py
+++ b/ennstatus/api/model.py
@@ -36,7 +36,11 @@ def calculate_weight(data):
 
     for subkey in ('1_week', '1_month', '3_months', '1_year', '5_years'):
 
-        subdata = data[subkey]
+        try:
+            subdata = data[subkey]
+        except KeyError:
+            continue
+
         factor = subdata['factor']
 
         values = [x * factor for x in subdata['values'] if x is not None]