diff --git a/ArchiSteamFarm/ASF.cs b/ArchiSteamFarm/ASF.cs
index 922316009..8f6056b46 100644
--- a/ArchiSteamFarm/ASF.cs
+++ b/ArchiSteamFarm/ASF.cs
@@ -287,7 +287,7 @@ namespace ArchiSteamFarm {
 				}
 
 				// Auto update logic starts here
-				if (releaseResponse.Assets == null) {
+				if (releaseResponse.Assets.IsEmpty) {
 					ArchiLogger.LogGenericWarning(Strings.ErrorUpdateNoAssets);
 
 					return null;
diff --git a/ArchiSteamFarm/ArchiWebHandler.cs b/ArchiSteamFarm/ArchiWebHandler.cs
index 7beda062d..2bed1379d 100644
--- a/ArchiSteamFarm/ArchiWebHandler.cs
+++ b/ArchiSteamFarm/ArchiWebHandler.cs
@@ -170,7 +170,7 @@ namespace ArchiSteamFarm {
 						yield break;
 					}
 
-					if ((response.Content.Assets == null) || (response.Content.Assets.Count == 0) || (response.Content.Descriptions == null) || (response.Content.Descriptions.Count == 0)) {
+					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)));
 					}
 
diff --git a/ArchiSteamFarm/BotConfig.cs b/ArchiSteamFarm/BotConfig.cs
index 707004fa6..f0769f873 100644
--- a/ArchiSteamFarm/BotConfig.cs
+++ b/ArchiSteamFarm/BotConfig.cs
@@ -297,7 +297,6 @@ namespace ArchiSteamFarm {
 		private string? BackingSteamPassword = DefaultSteamPassword;
 
 		[JsonProperty(PropertyName = SharedInfo.UlongCompatibilityStringPrefix + nameof(SteamMasterClanID), Required = Required.DisallowNull)]
-
 		private string SSteamMasterClanID {
 			get => SteamMasterClanID.ToString(CultureInfo.InvariantCulture);
 
@@ -313,7 +312,7 @@ namespace ArchiSteamFarm {
 		}
 
 		[JsonConstructor]
-		private BotConfig() { }
+		internal BotConfig() { }
 
 		internal (bool Valid, string? ErrorMessage) CheckValidation() {
 			if (BotBehaviour > EBotBehaviour.All) {
diff --git a/ArchiSteamFarm/GitHub.cs b/ArchiSteamFarm/GitHub.cs
index 3f7d79526..3c918fd46 100644
--- a/ArchiSteamFarm/GitHub.cs
+++ b/ArchiSteamFarm/GitHub.cs
@@ -101,7 +101,7 @@ namespace ArchiSteamFarm {
 		[SuppressMessage("ReSharper", "ClassCannotBeInstantiated")]
 		internal sealed class ReleaseResponse {
 			[JsonProperty(PropertyName = "assets", Required = Required.Always)]
-			internal readonly ImmutableHashSet<Asset>? Assets;
+			internal readonly ImmutableHashSet<Asset> Assets = ImmutableHashSet<Asset>.Empty;
 
 			[JsonProperty(PropertyName = "prerelease", Required = Required.Always)]
 			internal readonly bool IsPreRelease;
@@ -110,7 +110,7 @@ namespace ArchiSteamFarm {
 			internal readonly DateTime PublishedAt;
 
 			[JsonProperty(PropertyName = "tag_name", Required = Required.Always)]
-			internal readonly string? Tag;
+			internal readonly string Tag = "";
 
 			internal string? ChangelogHTML {
 				get {
diff --git a/ArchiSteamFarm/GlobalConfig.cs b/ArchiSteamFarm/GlobalConfig.cs
index 31611aabe..b09f401fc 100644
--- a/ArchiSteamFarm/GlobalConfig.cs
+++ b/ArchiSteamFarm/GlobalConfig.cs
@@ -283,7 +283,6 @@ namespace ArchiSteamFarm {
 		private string? BackingWebProxyPassword = DefaultWebProxyPassword;
 
 		[JsonProperty(PropertyName = SharedInfo.UlongCompatibilityStringPrefix + nameof(SteamOwnerID), Required = Required.DisallowNull)]
-
 		private string SSteamOwnerID {
 			get => SteamOwnerID.ToString(CultureInfo.InvariantCulture);
 
diff --git a/ArchiSteamFarm/IPC/Controllers/Api/ASFController.cs b/ArchiSteamFarm/IPC/Controllers/Api/ASFController.cs
index 38870d561..fac9a0e8c 100644
--- a/ArchiSteamFarm/IPC/Controllers/Api/ASFController.cs
+++ b/ArchiSteamFarm/IPC/Controllers/Api/ASFController.cs
@@ -109,10 +109,6 @@ namespace ArchiSteamFarm.IPC.Controllers.Api {
 				throw new InvalidOperationException(nameof(ASF.GlobalConfig));
 			}
 
-			if (request.GlobalConfig == null) {
-				return BadRequest(new GenericResponse(false, string.Format(CultureInfo.CurrentCulture, Strings.ErrorIsEmpty, nameof(request.GlobalConfig))));
-			}
-
 			(bool valid, string? errorMessage) = request.GlobalConfig.CheckValidation();
 
 			if (!valid) {
diff --git a/ArchiSteamFarm/IPC/Controllers/Api/BotController.cs b/ArchiSteamFarm/IPC/Controllers/Api/BotController.cs
index 93382f2da..e141fc986 100644
--- a/ArchiSteamFarm/IPC/Controllers/Api/BotController.cs
+++ b/ArchiSteamFarm/IPC/Controllers/Api/BotController.cs
@@ -97,10 +97,6 @@ namespace ArchiSteamFarm.IPC.Controllers.Api {
 				throw new InvalidOperationException(nameof(Bot.Bots));
 			}
 
-			if (request.BotConfig == null) {
-				return BadRequest(new GenericResponse(false, string.Format(CultureInfo.CurrentCulture, Strings.ErrorIsEmpty, nameof(request.BotConfig))));
-			}
-
 			(bool valid, string? errorMessage) = request.BotConfig.CheckValidation();
 
 			if (!valid) {
@@ -225,7 +221,7 @@ namespace ArchiSteamFarm.IPC.Controllers.Api {
 				throw new ArgumentNullException(nameof(request));
 			}
 
-			if ((request.GamesToRedeemInBackground == null) || (request.GamesToRedeemInBackground.Count == 0)) {
+			if (request.GamesToRedeemInBackground.Count == 0) {
 				return BadRequest(new GenericResponse(false, string.Format(CultureInfo.CurrentCulture, Strings.ErrorIsEmpty, nameof(request.GamesToRedeemInBackground))));
 			}
 
@@ -330,7 +326,7 @@ namespace ArchiSteamFarm.IPC.Controllers.Api {
 				throw new ArgumentNullException(nameof(request));
 			}
 
-			if ((request.KeysToRedeem == null) || (request.KeysToRedeem.Count == 0)) {
+			if (request.KeysToRedeem.Count == 0) {
 				return BadRequest(new GenericResponse(false, string.Format(CultureInfo.CurrentCulture, Strings.ErrorIsEmpty, nameof(request.KeysToRedeem))));
 			}
 
@@ -482,7 +478,7 @@ namespace ArchiSteamFarm.IPC.Controllers.Api {
 				return BadRequest(new GenericResponse<IReadOnlyDictionary<string, GenericResponse>>(false, string.Format(CultureInfo.CurrentCulture, Strings.BotNotFound, botNames)));
 			}
 
-			IList<(bool Success, string Message)> results = await Utilities.InParallel(bots.Select(bot => bot.Actions.HandleTwoFactorAuthenticationConfirmations(request.Accept, request.AcceptedType, request.AcceptedCreatorIDs?.Count > 0 ? request.AcceptedCreatorIDs : null, request.WaitIfNeeded))).ConfigureAwait(false);
+			IList<(bool Success, string Message)> results = await Utilities.InParallel(bots.Select(bot => bot.Actions.HandleTwoFactorAuthenticationConfirmations(request.Accept, request.AcceptedType, request.AcceptedCreatorIDs.Count > 0 ? request.AcceptedCreatorIDs : null, request.WaitIfNeeded))).ConfigureAwait(false);
 
 			Dictionary<string, GenericResponse> result = new(bots.Count, Bot.BotsComparer);
 
diff --git a/ArchiSteamFarm/IPC/Requests/ASFEncryptRequest.cs b/ArchiSteamFarm/IPC/Requests/ASFEncryptRequest.cs
index d18f48aed..ee3ba0661 100644
--- a/ArchiSteamFarm/IPC/Requests/ASFEncryptRequest.cs
+++ b/ArchiSteamFarm/IPC/Requests/ASFEncryptRequest.cs
@@ -38,7 +38,7 @@ namespace ArchiSteamFarm.IPC.Requests {
 		/// </summary>
 		[JsonProperty(Required = Required.Always)]
 		[Required]
-		public string? StringToEncrypt { get; private set; }
+		public string StringToEncrypt { get; private set; } = "";
 
 		[JsonConstructor]
 		private ASFEncryptRequest() { }
diff --git a/ArchiSteamFarm/IPC/Requests/ASFHashRequest.cs b/ArchiSteamFarm/IPC/Requests/ASFHashRequest.cs
index 4db98705f..df96d1c74 100644
--- a/ArchiSteamFarm/IPC/Requests/ASFHashRequest.cs
+++ b/ArchiSteamFarm/IPC/Requests/ASFHashRequest.cs
@@ -38,7 +38,7 @@ namespace ArchiSteamFarm.IPC.Requests {
 		/// </summary>
 		[JsonProperty(Required = Required.Always)]
 		[Required]
-		public string? StringToHash { get; private set; }
+		public string StringToHash { get; private set; } = "";
 
 		[JsonConstructor]
 		private ASFHashRequest() { }
diff --git a/ArchiSteamFarm/IPC/Requests/ASFRequest.cs b/ArchiSteamFarm/IPC/Requests/ASFRequest.cs
index 9f742997b..e40bfcbf2 100644
--- a/ArchiSteamFarm/IPC/Requests/ASFRequest.cs
+++ b/ArchiSteamFarm/IPC/Requests/ASFRequest.cs
@@ -31,7 +31,7 @@ namespace ArchiSteamFarm.IPC.Requests {
 		/// </summary>
 		[JsonProperty(Required = Required.Always)]
 		[Required]
-		public GlobalConfig? GlobalConfig { get; private set; }
+		public GlobalConfig GlobalConfig { get; private set; } = new();
 
 		[JsonConstructor]
 		private ASFRequest() { }
diff --git a/ArchiSteamFarm/IPC/Requests/BotGamesToRedeemInBackgroundRequest.cs b/ArchiSteamFarm/IPC/Requests/BotGamesToRedeemInBackgroundRequest.cs
index 3f79f6237..2c0b26b4b 100644
--- a/ArchiSteamFarm/IPC/Requests/BotGamesToRedeemInBackgroundRequest.cs
+++ b/ArchiSteamFarm/IPC/Requests/BotGamesToRedeemInBackgroundRequest.cs
@@ -36,7 +36,7 @@ namespace ArchiSteamFarm.IPC.Requests {
 		/// </remarks>
 		[JsonProperty(Required = Required.Always)]
 		[Required]
-		public OrderedDictionary? GamesToRedeemInBackground { get; private set; }
+		public OrderedDictionary GamesToRedeemInBackground { get; private set; } = new();
 
 		[JsonConstructor]
 		private BotGamesToRedeemInBackgroundRequest() { }
diff --git a/ArchiSteamFarm/IPC/Requests/BotInputRequest.cs b/ArchiSteamFarm/IPC/Requests/BotInputRequest.cs
index 49393664f..d9ab09be8 100644
--- a/ArchiSteamFarm/IPC/Requests/BotInputRequest.cs
+++ b/ArchiSteamFarm/IPC/Requests/BotInputRequest.cs
@@ -35,7 +35,7 @@ namespace ArchiSteamFarm.IPC.Requests {
 		///     Specifies the value for given input type (declared in <see cref="Type" />)
 		/// </summary>
 		[JsonProperty(Required = Required.Always)]
-		public string? Value { get; private set; }
+		public string Value { get; private set; } = "";
 
 		[JsonConstructor]
 		private BotInputRequest() { }
diff --git a/ArchiSteamFarm/IPC/Requests/BotRedeemRequest.cs b/ArchiSteamFarm/IPC/Requests/BotRedeemRequest.cs
index 7e39c5f98..48e052a46 100644
--- a/ArchiSteamFarm/IPC/Requests/BotRedeemRequest.cs
+++ b/ArchiSteamFarm/IPC/Requests/BotRedeemRequest.cs
@@ -32,7 +32,7 @@ namespace ArchiSteamFarm.IPC.Requests {
 		/// </summary>
 		[JsonProperty(Required = Required.Always)]
 		[Required]
-		public ImmutableHashSet<string>? KeysToRedeem { get; private set; }
+		public ImmutableHashSet<string> KeysToRedeem { get; private set; } = ImmutableHashSet<string>.Empty;
 
 		[JsonConstructor]
 		private BotRedeemRequest() { }
diff --git a/ArchiSteamFarm/IPC/Requests/BotRenameRequest.cs b/ArchiSteamFarm/IPC/Requests/BotRenameRequest.cs
index a789dc351..428068548 100644
--- a/ArchiSteamFarm/IPC/Requests/BotRenameRequest.cs
+++ b/ArchiSteamFarm/IPC/Requests/BotRenameRequest.cs
@@ -31,7 +31,7 @@ namespace ArchiSteamFarm.IPC.Requests {
 		/// </summary>
 		[JsonProperty(Required = Required.Always)]
 		[Required]
-		public string? NewName { get; private set; }
+		public string NewName { get; private set; } = "";
 
 		[JsonConstructor]
 		private BotRenameRequest() { }
diff --git a/ArchiSteamFarm/IPC/Requests/BotRequest.cs b/ArchiSteamFarm/IPC/Requests/BotRequest.cs
index 8038f6cdd..29144716b 100644
--- a/ArchiSteamFarm/IPC/Requests/BotRequest.cs
+++ b/ArchiSteamFarm/IPC/Requests/BotRequest.cs
@@ -31,7 +31,7 @@ namespace ArchiSteamFarm.IPC.Requests {
 		/// </summary>
 		[JsonProperty(Required = Required.Always)]
 		[Required]
-		public BotConfig? BotConfig { get; private set; }
+		public BotConfig BotConfig { get; private set; } = new();
 
 		[JsonConstructor]
 		private BotRequest() { }
diff --git a/ArchiSteamFarm/IPC/Requests/CommandRequest.cs b/ArchiSteamFarm/IPC/Requests/CommandRequest.cs
index bfbeece99..7a523e897 100644
--- a/ArchiSteamFarm/IPC/Requests/CommandRequest.cs
+++ b/ArchiSteamFarm/IPC/Requests/CommandRequest.cs
@@ -32,7 +32,7 @@ namespace ArchiSteamFarm.IPC.Requests {
 		/// </summary>
 		[JsonProperty(Required = Required.Always)]
 		[Required]
-		public string? Command { get; private set; }
+		public string Command { get; private set; } = "";
 
 		internal CommandRequest(string command) {
 			if (string.IsNullOrEmpty(command)) {
diff --git a/ArchiSteamFarm/IPC/Requests/TwoFactorAuthenticationConfirmationsRequest.cs b/ArchiSteamFarm/IPC/Requests/TwoFactorAuthenticationConfirmationsRequest.cs
index 3b16f6342..3f954915b 100644
--- a/ArchiSteamFarm/IPC/Requests/TwoFactorAuthenticationConfirmationsRequest.cs
+++ b/ArchiSteamFarm/IPC/Requests/TwoFactorAuthenticationConfirmationsRequest.cs
@@ -40,12 +40,12 @@ namespace ArchiSteamFarm.IPC.Requests {
 		///     Specifies IDs of the confirmations that we're supposed to handle. CreatorID of the confirmation is equal to ID of the object that triggered it - e.g. ID of the trade offer, or ID of the market listing. If not provided, or empty array, all confirmation IDs are considered for an action.
 		/// </summary>
 		[JsonProperty(Required = Required.DisallowNull)]
-		public ImmutableHashSet<ulong>? AcceptedCreatorIDs { get; private set; }
+		public ImmutableHashSet<ulong> AcceptedCreatorIDs { get; private set; } = ImmutableHashSet<ulong>.Empty;
 
 		/// <summary>
 		///     Specifies the type of confirmations to handle. If not provided, all confirmation types are considered for an action.
 		/// </summary>
-		[JsonProperty(Required = Required.DisallowNull)]
+		[JsonProperty]
 		public MobileAuthenticator.Confirmation.EType? AcceptedType { get; private set; }
 
 		/// <summary>
diff --git a/ArchiSteamFarm/IPC/Requests/WWWSendRequest.cs b/ArchiSteamFarm/IPC/Requests/WWWSendRequest.cs
index 85002de75..6fff02313 100644
--- a/ArchiSteamFarm/IPC/Requests/WWWSendRequest.cs
+++ b/ArchiSteamFarm/IPC/Requests/WWWSendRequest.cs
@@ -34,7 +34,7 @@ namespace ArchiSteamFarm.IPC.Requests {
 		/// </remarks>
 		[Required]
 		[JsonProperty(Required = Required.Always)]
-		public string? URL { get; private set; }
+		public string URL { get; private set; } = "";
 
 		[JsonConstructor]
 		private WWWSendRequest() { }
diff --git a/ArchiSteamFarm/IPC/Responses/GitHubReleaseResponse.cs b/ArchiSteamFarm/IPC/Responses/GitHubReleaseResponse.cs
index 0a8add30b..54ecee1d4 100644
--- a/ArchiSteamFarm/IPC/Responses/GitHubReleaseResponse.cs
+++ b/ArchiSteamFarm/IPC/Responses/GitHubReleaseResponse.cs
@@ -30,7 +30,7 @@ namespace ArchiSteamFarm.IPC.Responses {
 		/// </summary>
 		[JsonProperty(Required = Required.Always)]
 		[Required]
-		public string? ChangelogHTML { get; private set; }
+		public string ChangelogHTML { get; private set; }
 
 		/// <summary>
 		///     Date of the release.
@@ -51,14 +51,14 @@ namespace ArchiSteamFarm.IPC.Responses {
 		/// </summary>
 		[JsonProperty(Required = Required.Always)]
 		[Required]
-		public string? Version { get; private set; }
+		public string Version { get; private set; }
 
 		internal GitHubReleaseResponse(GitHub.ReleaseResponse releaseResponse) {
 			if (releaseResponse == null) {
 				throw new ArgumentNullException(nameof(releaseResponse));
 			}
 
-			ChangelogHTML = releaseResponse.ChangelogHTML;
+			ChangelogHTML = releaseResponse.ChangelogHTML ?? "";
 			ReleasedAt = releaseResponse.PublishedAt;
 			Stable = !releaseResponse.IsPreRelease;
 			Version = releaseResponse.Tag;
diff --git a/ArchiSteamFarm/Json/Steam.cs b/ArchiSteamFarm/Json/Steam.cs
index 09689bf98..e5e063b8e 100644
--- a/ArchiSteamFarm/Json/Steam.cs
+++ b/ArchiSteamFarm/Json/Steam.cs
@@ -253,11 +253,11 @@ namespace ArchiSteamFarm.Json {
 			public sealed class Tag {
 				[JsonProperty(PropertyName = "category", Required = Required.Always)]
 				[PublicAPI]
-				public string? Identifier { get; private set; }
+				public string Identifier { get; private set; } = "";
 
 				[JsonProperty(PropertyName = "internal_name", Required = Required.Always)]
 				[PublicAPI]
-				public string? Value { get; private set; }
+				public string Value { get; private set; } = "";
 
 				internal Tag(string identifier, string value) {
 					Identifier = !string.IsNullOrEmpty(identifier) ? identifier : throw new ArgumentNullException(nameof(identifier));
@@ -366,13 +366,13 @@ namespace ArchiSteamFarm.Json {
 		[SuppressMessage("ReSharper", "ClassCannotBeInstantiated")]
 		internal sealed class InventoryResponse : EResultResponse {
 			[JsonProperty(PropertyName = "assets", Required = Required.DisallowNull)]
-			internal readonly ImmutableHashSet<Asset>? Assets;
+			internal readonly ImmutableHashSet<Asset> Assets = ImmutableHashSet<Asset>.Empty;
 
 			[JsonProperty(PropertyName = "descriptions", Required = Required.DisallowNull)]
-			internal readonly ImmutableHashSet<Description>? Descriptions;
+			internal readonly ImmutableHashSet<Description> Descriptions = ImmutableHashSet<Description>.Empty;
 
 			[JsonProperty(PropertyName = "error", Required = Required.DisallowNull)]
-			internal readonly string? Error;
+			internal readonly string Error = "";
 
 			[JsonProperty(PropertyName = "total_inventory_count", Required = Required.DisallowNull)]
 			internal readonly uint TotalInventoryCount;
@@ -414,10 +414,6 @@ namespace ArchiSteamFarm.Json {
 			internal sealed class Description {
 				internal Asset.ERarity Rarity {
 					get {
-						if (Tags == null) {
-							return Asset.ERarity.Unknown;
-						}
-
 						foreach (Asset.Tag tag in Tags) {
 							switch (tag.Identifier) {
 								case "droprate":
@@ -444,10 +440,6 @@ namespace ArchiSteamFarm.Json {
 
 				internal uint RealAppID {
 					get {
-						if (Tags == null) {
-							return 0;
-						}
-
 						foreach (Asset.Tag tag in Tags) {
 							switch (tag.Identifier) {
 								case "Game":
@@ -475,10 +467,6 @@ namespace ArchiSteamFarm.Json {
 
 				internal Asset.EType Type {
 					get {
-						if (Tags == null) {
-							return Asset.EType.Unknown;
-						}
-
 						Asset.EType type = Asset.EType.Unknown;
 
 						foreach (Asset.Tag tag in Tags) {
@@ -554,7 +542,7 @@ namespace ArchiSteamFarm.Json {
 				internal bool Marketable { get; set; }
 
 				[JsonProperty(PropertyName = "tags", Required = Required.DisallowNull)]
-				internal ImmutableHashSet<Asset.Tag>? Tags { get; set; }
+				internal ImmutableHashSet<Asset.Tag> Tags { get; set; } = ImmutableHashSet<Asset.Tag>.Empty;
 
 				internal bool Tradable { get; set; }
 
@@ -620,7 +608,7 @@ namespace ArchiSteamFarm.Json {
 		[SuppressMessage("ReSharper", "ClassCannotBeInstantiated")]
 		internal sealed class NewDiscoveryQueueResponse {
 			[JsonProperty(PropertyName = "queue", Required = Required.Always)]
-			internal readonly ImmutableHashSet<uint>? Queue;
+			internal readonly ImmutableHashSet<uint> Queue = ImmutableHashSet<uint>.Empty;
 
 			[JsonConstructor]
 			private NewDiscoveryQueueResponse() { }
@@ -629,7 +617,7 @@ namespace ArchiSteamFarm.Json {
 		[SuppressMessage("ReSharper", "ClassCannotBeInstantiated")]
 		internal sealed class RedeemWalletResponse : EResultResponse {
 			[JsonProperty(PropertyName = "detail", Required = Required.DisallowNull)]
-			internal readonly EPurchaseResultDetail? PurchaseResultDetail;
+			internal readonly EPurchaseResultDetail PurchaseResultDetail;
 
 			[JsonConstructor]
 			private RedeemWalletResponse() { }
@@ -638,7 +626,7 @@ namespace ArchiSteamFarm.Json {
 		[SuppressMessage("ReSharper", "ClassCannotBeInstantiated")]
 		internal sealed class TradeOfferAcceptResponse {
 			[JsonProperty(PropertyName = "strError", Required = Required.DisallowNull)]
-			internal readonly string? ErrorText;
+			internal readonly string ErrorText = "";
 
 			[JsonProperty(PropertyName = "needs_mobile_confirmation", Required = Required.DisallowNull)]
 			internal readonly bool RequiresMobileConfirmation;
@@ -698,7 +686,7 @@ namespace ArchiSteamFarm.Json {
 			internal readonly ECommentPermission CommentPermission;
 
 			[JsonProperty(PropertyName = "PrivacySettings", Required = Required.Always)]
-			internal readonly PrivacySettings? Settings;
+			internal readonly PrivacySettings Settings = new();
 
 			// Constructed from privacy change request
 			internal UserPrivacy(PrivacySettings settings, ECommentPermission commentPermission) {
@@ -763,7 +751,7 @@ namespace ArchiSteamFarm.Json {
 				}
 
 				[JsonConstructor]
-				private PrivacySettings() { }
+				internal PrivacySettings() { }
 			}
 
 			internal enum ECommentPermission : byte {
diff --git a/ArchiSteamFarm/MobileAuthenticator.cs b/ArchiSteamFarm/MobileAuthenticator.cs
index 2ae1dfbb7..494448b1f 100644
--- a/ArchiSteamFarm/MobileAuthenticator.cs
+++ b/ArchiSteamFarm/MobileAuthenticator.cs
@@ -57,12 +57,12 @@ namespace ArchiSteamFarm {
 
 #pragma warning disable 649
 		[JsonProperty(PropertyName = "identity_secret", Required = Required.Always)]
-		private readonly string? IdentitySecret;
+		private readonly string IdentitySecret = "";
 #pragma warning restore 649
 
 #pragma warning disable 649
 		[JsonProperty(PropertyName = "shared_secret", Required = Required.Always)]
-		private readonly string? SharedSecret;
+		private readonly string SharedSecret = "";
 #pragma warning restore 649
 
 		private Bot? Bot;
diff --git a/ArchiSteamFarm/Statistics.cs b/ArchiSteamFarm/Statistics.cs
index 92d9f1775..4021a2ee7 100644
--- a/ArchiSteamFarm/Statistics.cs
+++ b/ArchiSteamFarm/Statistics.cs
@@ -716,7 +716,7 @@ namespace ArchiSteamFarm {
 
 #pragma warning disable 649
 			[JsonProperty(PropertyName = "trade_token", Required = Required.Always)]
-			internal readonly string? TradeToken;
+			internal readonly string TradeToken = "";
 #pragma warning restore 649
 
 			internal float Score => GamesCount / (float) ItemsCount;
diff --git a/ArchiSteamFarm/SteamKit2/ServerRecordEndPoint.cs b/ArchiSteamFarm/SteamKit2/ServerRecordEndPoint.cs
index d3105b998..817930faa 100644
--- a/ArchiSteamFarm/SteamKit2/ServerRecordEndPoint.cs
+++ b/ArchiSteamFarm/SteamKit2/ServerRecordEndPoint.cs
@@ -27,7 +27,7 @@ using SteamKit2;
 namespace ArchiSteamFarm.SteamKit2 {
 	internal sealed class ServerRecordEndPoint : IEquatable<ServerRecordEndPoint> {
 		[JsonProperty(Required = Required.Always)]
-		internal readonly string? Host;
+		internal readonly string Host = "";
 
 		[JsonProperty(Required = Required.Always)]
 		internal readonly ushort Port;