diff --git a/kernel/model/flashcard.go b/kernel/model/flashcard.go
index 471788f94..0f904ebc3 100644
--- a/kernel/model/flashcard.go
+++ b/kernel/model/flashcard.go
@@ -936,8 +936,7 @@ func (tx *Transaction) doAddFlashcards(operation *Operation) (ret *TxErr) {
 			continue
 		}
 
-		cardID := ast.NewNodeID()
-		deck.AddCard(cardID, blockID)
+		deck.AddCard(ast.NewNodeID(), blockID)
 	}
 
 	if err := deck.Save(); err != nil {
diff --git a/kernel/model/import.go b/kernel/model/import.go
index 200289df1..44dccccf4 100644
--- a/kernel/model/import.go
+++ b/kernel/model/import.go
@@ -352,7 +352,7 @@ func ImportSY(zipPath, boxID, toPath string) (err error) {
 			bIDs := deckToImport.GetBlockIDs()
 			cards := deckToImport.GetCardsByBlockIDs(bIDs)
 			for _, card := range cards {
-				deck.AddCard(card.ID(), blockIDs[card.BlockID()])
+				deck.AddCard(ast.NewNodeID(), blockIDs[card.BlockID()])
 			}
 
 			if 0 < len(cards) {