diff --git a/ArchiSteamFarm/ArchiWebHandler.cs b/ArchiSteamFarm/ArchiWebHandler.cs
index d7c089bf6..04ba72d50 100644
--- a/ArchiSteamFarm/ArchiWebHandler.cs
+++ b/ArchiSteamFarm/ArchiWebHandler.cs
@@ -149,7 +149,7 @@ namespace ArchiSteamFarm {
 			ulong startAssetID = 0;
 
 			// We need to store asset IDs to make sure we won't get duplicate items
-			HashSet<ulong> assetIDs = new();
+			HashSet<ulong>? assetIDs = null;
 
 			while (true) {
 				await ASF.InventorySemaphore.WaitAsync().ConfigureAwait(false);
@@ -170,6 +170,8 @@ namespace ArchiSteamFarm {
 						yield break;
 					}
 
+					assetIDs ??= new HashSet<ulong>((int) response.Content.TotalInventoryCount);
+
 					if ((response.Content.Assets.Count == 0) || (response.Content.Descriptions.Count == 0)) {
 						throw new NotSupportedException(string.Format(CultureInfo.CurrentCulture, Strings.ErrorObjectIsNull, nameof(response.Content.Assets) + " || " + nameof(response.Content.Descriptions)));
 					}