catch empty list (#4444)

hedyorg · Sep 1, 2023 · fb7f0c0 · fb7f0c0
1 parent a4bf3c0
commit fb7f0c0
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/website/for_teachers.py b/website/for_teachers.py
@@ -378,7 +378,7 @@ def get_class_info(self, user, class_id):
                         customizations['sorted_adventures'][str(level)].append(
                             {"name": adventure, "from_teacher": False})
             self.db.update_class_customizations(customizations)
-            min_level = min(customizations['levels'])
+            min_level = 1 if customizations['levels'] == [] else min(customizations['levels'])
         else:
             # Since it doesn't have customizations loaded, we create a default customization object.
             # This makes further updating with HTMX easier