diff --git a/rslib/src/storage/notetype/existing_cards.sql b/rslib/src/storage/notetype/existing_cards.sql
index 110c80f8b..5f4658e05 100644
--- a/rslib/src/storage/notetype/existing_cards.sql
+++ b/rslib/src/storage/notetype/existing_cards.sql
@@ -17,8 +17,8 @@ select
       when 0 then (
         case
           odue
-          when 0 then due
-          else odue
+          when 0 then max(0, due)
+          else max(odue, 0)
         end
       )
       else null