diff --git a/SVSimLoader/CaptureWriter.cs b/SVSimLoader/CaptureWriter.cs
index fd5a23c..977f12f 100644
--- a/SVSimLoader/CaptureWriter.cs
+++ b/SVSimLoader/CaptureWriter.cs
@@ -384,6 +384,12 @@ internal static class CaptureWriter
             for (int i = 0; i < deckList.Count; i++)
             {
                 var entry = deckList[i];
+                // /load/index ships every deck slot, most of them empty placeholders. Skip the
+                // empty ones — the import drops them anyway, and it keeps the dump to the few real
+                // decks instead of ~100 empty slots.
+                var cardArr = ExtractLongArray(entry, "card_id_array");
+                if (cardArr == null || cardArr.Count == 0) continue;
+
                 var d = new Dictionary<string, object> { { "deck_format", fmt.Format } };
                 Copy(entry, "deck_no", d, "deck_no");
                 Copy(entry, "deck_name", d, "deck_name");
@@ -392,8 +398,7 @@ internal static class CaptureWriter
                 Copy(entry, "leader_skin_id", d, "leader_skin_id");
                 Copy(entry, "is_random_leader_skin", d, "is_random_leader_skin");
                 Copy(entry, "rotation_id", d, "my_rotation_id"); // UserDeck.rotation_id -> import my_rotation_id
-                var arr = ExtractLongArray(entry, "card_id_array");
-                if (arr != null) d["card_id_array"] = arr;
+                d["card_id_array"] = cardArr;
                 decks.Add(d);
             }
         }