diff --git a/ArchiSteamFarm/Steam/Data/Asset.cs b/ArchiSteamFarm/Steam/Data/Asset.cs
index 1d3814b32..5508c0ed0 100644
--- a/ArchiSteamFarm/Steam/Data/Asset.cs
+++ b/ArchiSteamFarm/Steam/Data/Asset.cs
@@ -88,7 +88,7 @@ namespace ArchiSteamFarm.Steam.Data {
 		[PublicAPI]
 		public EType Type { get; internal set; }
 
-		[JsonExtensionData]
+		[JsonExtensionData(WriteData = false)]
 		internal Dictionary<string, JToken>? AdditionalProperties { private get; set; }
 
 		[JsonProperty(PropertyName = "amount", Required = Required.Always)]
diff --git a/ArchiSteamFarm/Steam/Data/InventoryResponse.cs b/ArchiSteamFarm/Steam/Data/InventoryResponse.cs
index b6c6d892f..f6ddd1a7a 100644
--- a/ArchiSteamFarm/Steam/Data/InventoryResponse.cs
+++ b/ArchiSteamFarm/Steam/Data/InventoryResponse.cs
@@ -191,7 +191,7 @@ namespace ArchiSteamFarm.Steam.Data {
 				}
 			}
 
-			[JsonExtensionData]
+			[JsonExtensionData(WriteData = false)]
 			internal Dictionary<string, JToken>? AdditionalProperties {
 				get;
 				[UsedImplicitly]