diff --git a/app/src/main/java/protect/card_locker/BarcodeImageWriterTask.java b/app/src/main/java/protect/card_locker/BarcodeImageWriterTask.java
index a03a52994..9ef6b7115 100644
--- a/app/src/main/java/protect/card_locker/BarcodeImageWriterTask.java
+++ b/app/src/main/java/protect/card_locker/BarcodeImageWriterTask.java
@@ -90,6 +90,11 @@ class BarcodeImageWriterTask extends AsyncTask<Void, Void, Bitmap>
 
     public Bitmap doInBackground(Void... params)
     {
+        if (cardId.isEmpty())
+        {
+            return null;
+        }
+
         MultiFormatWriter writer = new MultiFormatWriter();
         BitMatrix bitMatrix;
         try