diff --git a/anki/deck.py b/anki/deck.py
index 8ae41e991..92fa9281b 100644
--- a/anki/deck.py
+++ b/anki/deck.py
@@ -358,6 +358,7 @@ type = (case
 when successive then 1 when reps then 0 else 2 end),
 relativeDelay = (case
 when successive then 1 when reps then 0 else 2 end)
+where type >= 0
 """)
         # old-style suspended cards
         self.s.statement(