diff --git a/db_compare.py b/db_compare.py
index 6c13883b..a2775e9c 100644
--- a/db_compare.py
+++ b/db_compare.py
@@ -320,7 +320,9 @@ def check_uloha():
 
 	for o,n in res:
 		check_same(o,n, old_fields, new_fields)
-	# TODO: cislo_deadline
+		# Datum deadline vypadá prázdně, tak to budeme předpokládat.
+		if n['datum_deadline'] is not None:
+			raise ValueError("Úloha má deadline.")
 
 def check_tema():
 	old_query = "SELECT * FROM seminar_problemy WHERE typ IN ('tema', 'serial') ORDER BY id"