diff --git a/competition/serializers.py b/competition/serializers.py
index c90ce14..1cf07c3 100644
--- a/competition/serializers.py
+++ b/competition/serializers.py
@@ -399,6 +399,9 @@ def validate(self, attrs):
         if attrs.get('season_code', 0) not in (0, 1):
             raise ValidationError(
                 'Seminár musí byť zimný alebo letný(season_code 0 alebo 1)')
+        competition: models.Competition | None = attrs.get('competition')
+        if competition and competition.competition_type.name != "Seminár":
+            raise ValidationError('Súťaž nie je typu seminár')
         return super().validate(attrs)
 
     def get_complete(self, obj: models.Semester):