diff --git a/app/scodoc/sco_preferences.py b/app/scodoc/sco_preferences.py
index c4955cd5..5a35c267 100644
--- a/app/scodoc/sco_preferences.py
+++ b/app/scodoc/sco_preferences.py
@@ -272,7 +272,7 @@ class BasePreferences(object):
     def __init__(self, dept_id: int):
         dept = Departement.query.get(dept_id)
         if not dept:
-            raise ScoValueError(f"Invalid departement: {dept_id}")
+            raise ScoValueError(f"BasePreferences: Invalid departement: {dept_id}")
         self.dept_id = dept.id
         self.init()
         self.load()
@@ -2152,7 +2152,10 @@ class SemPreferences:
 
     def __init__(self, formsemestre_id=None, dept_id=None):
         self.formsemestre_id = formsemestre_id
-        self.base_prefs = get_base_preferences(dept_id=dept_id)
+        if dept_id is None and g.scodoc_dept is None:
+            self.base_prefs = {}
+        else:
+            self.base_prefs = get_base_preferences(dept_id=dept_id)
 
     def __getitem__(self, name):
         return self.base_prefs.get(self.formsemestre_id, name)