diff --git a/advlabdb/models.py b/advlabdb/models.py
index d076e2a..2340e63 100644
--- a/advlabdb/models.py
+++ b/advlabdb/models.py
@@ -203,7 +203,7 @@ class GroupExperiment(db.Model):
     # An experiment specified to a group
     id = db.Column(db.Integer, primary_key=True)
     note = db.Column(db.Text, nullable=True)
-    experiment_marks_missing = db.Column(db.Boolean, default=False, nullable=False)
+    experiment_marks_missing = db.Column(db.Boolean, default=True, nullable=False)
 
     semester_experiment_id = db.Column(db.Integer, db.ForeignKey("semester_experiment.id"), nullable=False)
     semester_experiment = db.relationship("SemesterExperiment", back_populates="group_experiments")
@@ -242,10 +242,10 @@ class GroupExperiment(db.Model):
     def update_experiment_marks_missing(self):
         for experiment_mark in self.experiment_marks:
             if experiment_mark.final_experiment_mark is None:
-                self.experiment_marks_missing = False
+                self.experiment_marks_missing = True
                 return
 
-        self.experiment_marks_missing = True
+        self.experiment_marks_missing = False
 
 
 class Experiment(db.Model):