diff --git a/seminar/models/odevzdavatko.py b/seminar/models/odevzdavatko.py
index ac6c097c..0fad97f8 100644
--- a/seminar/models/odevzdavatko.py
+++ b/seminar/models/odevzdavatko.py
@@ -177,7 +177,7 @@ class Hodnoceni(bm.SeminarModelBase):
 
 	@property
 	def body_neprepocitane_max(self):
-		if not isinstance(self.problem, am.Uloha):
+		if not isinstance(self.problem.get_real_instance(), am.Uloha):
 			return None
 		return self.problem.uloha.max_body