diff --git a/ArchiSteamFarm/BotConfig.cs b/ArchiSteamFarm/BotConfig.cs
index 2fb7aa959..f92ddcf3c 100644
--- a/ArchiSteamFarm/BotConfig.cs
+++ b/ArchiSteamFarm/BotConfig.cs
@@ -118,11 +118,6 @@ namespace ArchiSteamFarm {
 		internal readonly bool ShutdownOnFarmingFinished;
 #pragma warning restore 649
 
-#pragma warning disable 649
-		[JsonProperty(Required = Required.DisallowNull)]
-		internal readonly ulong SteamMasterClanID;
-#pragma warning restore 649
-
 #pragma warning disable 649
 		[JsonProperty]
 		internal readonly string SteamTradeToken;
@@ -135,9 +130,24 @@ namespace ArchiSteamFarm {
 		[JsonProperty(Required = Required.DisallowNull)]
 		internal readonly ETradingPreferences TradingPreferences = ETradingPreferences.None;
 
+		[JsonProperty(PropertyName = GlobalConfig.UlongStringPrefix + nameof(SteamMasterClanID), Required = Required.DisallowNull)]
+		internal string SSteamMasterClanID {
+			set {
+				if (string.IsNullOrEmpty(value) || !ulong.TryParse(value, out ulong result)) {
+					ASF.ArchiLogger.LogGenericError(string.Format(Strings.ErrorIsInvalid, nameof(SSteamMasterClanID)));
+					return;
+				}
+
+				SteamMasterClanID = result;
+			}
+		}
+
 		[JsonProperty]
 		internal string SteamLogin { get; set; }
 
+		[JsonProperty(Required = Required.DisallowNull)]
+		internal ulong SteamMasterClanID { get; private set; }
+
 		[JsonProperty]
 		internal string SteamParentalPIN { get; set; } = "0";
 
diff --git a/ArchiSteamFarm/GlobalConfig.cs b/ArchiSteamFarm/GlobalConfig.cs
index 9ce7e1931..0b2824fc7 100644
--- a/ArchiSteamFarm/GlobalConfig.cs
+++ b/ArchiSteamFarm/GlobalConfig.cs
@@ -38,6 +38,7 @@ namespace ArchiSteamFarm {
 		internal const byte DefaultConnectionTimeout = 60;
 		internal const ushort DefaultIPCPort = 1242;
 		internal const byte DefaultLoginLimiterDelay = 10;
+		internal const string UlongStringPrefix = "_s";
 
 		// This is hardcoded blacklist which should not be possible to change
 		internal static readonly HashSet<uint> GlobalBlacklist = new HashSet<uint> { 267420, 303700, 335590, 368020, 425280, 480730, 566020, 639900 };
@@ -100,11 +101,6 @@ namespace ArchiSteamFarm {
 		[JsonProperty(Required = Required.DisallowNull)]
 		internal readonly bool Statistics = true;
 
-#pragma warning disable 649
-		[JsonProperty(Required = Required.DisallowNull)]
-		internal readonly ulong SteamOwnerID;
-#pragma warning restore 649
-
 		[JsonProperty(Required = Required.DisallowNull)]
 		internal readonly ProtocolType SteamProtocol = ProtocolType.Tcp;
 
@@ -114,6 +110,21 @@ namespace ArchiSteamFarm {
 		[JsonProperty]
 		internal string IPCHost { get; set; } = "127.0.0.1";
 
+		[JsonProperty(PropertyName = UlongStringPrefix + nameof(SteamOwnerID), Required = Required.DisallowNull)]
+		internal string SSteamOwnerID {
+			set {
+				if (string.IsNullOrEmpty(value) || !ulong.TryParse(value, out ulong result)) {
+					ASF.ArchiLogger.LogGenericError(string.Format(Strings.ErrorIsInvalid, nameof(SSteamOwnerID)));
+					return;
+				}
+
+				SteamOwnerID = result;
+			}
+		}
+
+		[JsonProperty(Required = Required.DisallowNull)]
+		internal ulong SteamOwnerID { get; private set; }
+
 		// This constructor is used only by deserializer
 		private GlobalConfig() { }
 
diff --git a/ArchiSteamFarm/config/ASF.json b/ArchiSteamFarm/config/ASF.json
index 7cc9ad23b..b2075b150 100644
--- a/ArchiSteamFarm/config/ASF.json
+++ b/ArchiSteamFarm/config/ASF.json
@@ -1,23 +1,23 @@
 {
-    "AutoRestart": true,
-    "AutoUpdates": true,
-    "Blacklist": [],
-    "ConnectionTimeout": 60,
-    "CurrentCulture": null,
-    "Debug": false,
-    "FarmingDelay": 15,
-    "GiftsLimiterDelay": 1,
-    "Headless": false,
-    "IdleFarmingPeriod": 3,
-    "InventoryLimiterDelay": 3,
-    "IPCHost": "127.0.0.1",
-    "IPCPort": 1242,
-    "LoginLimiterDelay": 10,
-    "MaxFarmingTime": 10,
-    "MaxTradeHoldDuration": 15,
-    "OptimizationMode": 0,
-    "Statistics": true,
-    "SteamOwnerID": 0,
-    "SteamProtocol": 6,
-    "UpdateChannel": 1
-}
\ No newline at end of file
+  "AutoRestart": true,
+  "AutoUpdates": true,
+  "Blacklist": [],
+  "ConnectionTimeout": 60,
+  "CurrentCulture": null,
+  "Debug": false,
+  "FarmingDelay": 15,
+  "GiftsLimiterDelay": 1,
+  "Headless": false,
+  "IdleFarmingPeriod": 3,
+  "InventoryLimiterDelay": 3,
+  "IPCHost": "127.0.0.1",
+  "IPCPort": 1242,
+  "LoginLimiterDelay": 10,
+  "MaxFarmingTime": 10,
+  "MaxTradeHoldDuration": 15,
+  "OptimizationMode": 0,
+  "Statistics": true,
+  "SteamOwnerID": 0,
+  "SteamProtocol": 6,
+  "UpdateChannel": 1
+}
diff --git a/ArchiSteamFarm/config/example.json b/ArchiSteamFarm/config/example.json
index baaf8d778..fe6e0b18b 100644
--- a/ArchiSteamFarm/config/example.json
+++ b/ArchiSteamFarm/config/example.json
@@ -1,31 +1,31 @@
 {
-    "AcceptGifts": false,
-    "CardDropsRestricted": true,
-    "CustomGamePlayedWhileFarming": null,
-    "CustomGamePlayedWhileIdle": null,
-    "DismissInventoryNotifications": false,
-    "Enabled": false,
-    "FarmingOrder": 0,
-    "FarmOffline": false,
-    "GamesPlayedWhileIdle": [],
-    "HandleOfflineMessages": false,
-    "IsBotAccount": false,
-    "LootableTypes": [
-        1,
-        3,
-        5
-    ],
-    "PasswordFormat": 0,
-    "Paused": false,
-    "RedeemingPreferences": 0,
-    "SendOnFarmingFinished": false,
-    "SendTradePeriod": 0,
-    "ShutdownOnFarmingFinished": false,
-    "SteamLogin": null,
-    "SteamMasterClanID": 0,
-    "SteamParentalPIN": "0",
-    "SteamPassword": null,
-    "SteamTradeToken": null,
-    "SteamUserPermissions": {},
-    "TradingPreferences": 0
-}
\ No newline at end of file
+  "AcceptGifts": false,
+  "CardDropsRestricted": true,
+  "CustomGamePlayedWhileFarming": null,
+  "CustomGamePlayedWhileIdle": null,
+  "DismissInventoryNotifications": false,
+  "Enabled": false,
+  "FarmingOrder": 0,
+  "FarmOffline": false,
+  "GamesPlayedWhileIdle": [],
+  "HandleOfflineMessages": false,
+  "IsBotAccount": false,
+  "LootableTypes": [
+    1,
+    3,
+    5
+  ],
+  "PasswordFormat": 0,
+  "Paused": false,
+  "RedeemingPreferences": 0,
+  "SendOnFarmingFinished": false,
+  "SendTradePeriod": 0,
+  "ShutdownOnFarmingFinished": false,
+  "SteamLogin": null,
+  "SteamMasterClanID": 0,
+  "SteamParentalPIN": "0",
+  "SteamPassword": null,
+  "SteamTradeToken": null,
+  "SteamUserPermissions": {},
+  "TradingPreferences": 0
+}
diff --git a/ArchiSteamFarm/config/minimal.json b/ArchiSteamFarm/config/minimal.json
index 22e780aca..0fbfec585 100644
--- a/ArchiSteamFarm/config/minimal.json
+++ b/ArchiSteamFarm/config/minimal.json
@@ -1,5 +1,5 @@
 {
-    "Enabled": false,
-    "SteamLogin": null,
-    "SteamPassword": null
-}
\ No newline at end of file
+  "Enabled": false,
+  "SteamLogin": null,
+  "SteamPassword": null
+}