diff --git a/ucs-school-lib/python/models/user.py b/ucs-school-lib/python/models/user.py
index cea4d49..1fabe55 100644
--- a/ucs-school-lib/python/models/user.py
+++ b/ucs-school-lib/python/models/user.py
@@ -208,7 +208,7 @@ class User(UCSSchoolHelperAbstractClass):
 		obj.password = None
 		obj.school_classes = cls.get_school_classes(udm_obj, obj)
 		if obj.school_classes is None:
-			del obj.school_classes
+			obj.school_classes = {}
 		return obj
 
 	def do_create(self, udm_obj, lo):