diff --git a/advlabdb/models.py b/advlabdb/models.py
index f091549..b9f9095 100644
--- a/advlabdb/models.py
+++ b/advlabdb/models.py
@@ -520,7 +520,7 @@ class ExperimentMark(db.Model):
                 raise DataBaseException("The group of the part student does not have the given group experiment!")
 
     def __init__(self, part_student, group_experiment):
-        ExperimentMark(part_student, group_experiment)
+        ExperimentMark.check(part_student, group_experiment)
 
         super().__init__(part_student=part_student, group_experiment=group_experiment)