diff --git a/ArchiSteamFarm/ArchiHandler.cs b/ArchiSteamFarm/ArchiHandler.cs
index fe8bb3bd4..66b8705db 100644
--- a/ArchiSteamFarm/ArchiHandler.cs
+++ b/ArchiSteamFarm/ArchiHandler.cs
@@ -67,7 +67,7 @@ namespace ArchiSteamFarm {
 				}
 			}
 
-			internal readonly List<Notification> Notifications;
+			internal readonly HashSet<Notification> Notifications;
 
 			internal NotificationsCallback(JobID jobID, CMsgClientUserNotifications msg) {
 				JobID = jobID;
@@ -76,7 +76,7 @@ namespace ArchiSteamFarm {
 					return;
 				}
 
-				Notifications = new List<Notification>(msg.notifications.Count);
+				Notifications = new HashSet<Notification>();
 				foreach (var notification in msg.notifications) {
 					Notifications.Add(new Notification((Notification.ENotificationType) notification.user_notification_type));
 				}
@@ -90,7 +90,7 @@ namespace ArchiSteamFarm {
 				}
 
 				if (msg.count_new_items > 0) {
-					Notifications = new List<Notification>(1) {
+					Notifications = new HashSet<Notification>() {
 						new Notification(Notification.ENotificationType.Items)
 					};
 				}
@@ -99,7 +99,6 @@ namespace ArchiSteamFarm {
 
 		internal sealed class OfflineMessageCallback : CallbackMsg {
 			internal readonly uint OfflineMessages;
-			internal readonly List<uint> Users;
 
 			internal OfflineMessageCallback(JobID jobID, CMsgClientOfflineMessageNotification msg) {
 				JobID = jobID;
@@ -109,7 +108,6 @@ namespace ArchiSteamFarm {
 				}
 
 				OfflineMessages = msg.offline_messages;
-				Users = msg.friends_with_offline_messages;
 			}
 		}
 
diff --git a/ArchiSteamFarm/ArchiWebHandler.cs b/ArchiSteamFarm/ArchiWebHandler.cs
index 099239679..f69dc59fe 100644
--- a/ArchiSteamFarm/ArchiWebHandler.cs
+++ b/ArchiSteamFarm/ArchiWebHandler.cs
@@ -194,15 +194,13 @@ namespace ArchiSteamFarm {
 		}
 
 		internal async Task<bool> RefreshSessionIfNeeded() {
-			DateTime now = DateTime.Now;
-			if (now.Subtract(LastSessionRefreshCheck).TotalSeconds < MinSessionTTL) {
+			if (DateTime.Now.Subtract(LastSessionRefreshCheck).TotalSeconds < MinSessionTTL) {
 				return true;
 			}
 
 			await SessionSemaphore.WaitAsync().ConfigureAwait(false);
 
-			now = DateTime.Now;
-			if (now.Subtract(LastSessionRefreshCheck).TotalSeconds < MinSessionTTL) {
+			if (DateTime.Now.Subtract(LastSessionRefreshCheck).TotalSeconds < MinSessionTTL) {
 				SessionSemaphore.Release();
 				return true;
 			}
@@ -212,8 +210,7 @@ namespace ArchiSteamFarm {
 			bool? isLoggedIn = await IsLoggedIn().ConfigureAwait(false);
 			if (isLoggedIn.GetValueOrDefault(true)) {
 				result = true;
-				now = DateTime.Now;
-				LastSessionRefreshCheck = now;
+				LastSessionRefreshCheck = DateTime.Now;
 			} else {
 				Logging.LogGenericInfo("Refreshing our session!", Bot.BotName);
 				result = await Bot.RefreshSession().ConfigureAwait(false);
diff --git a/ArchiSteamFarm/Bot.cs b/ArchiSteamFarm/Bot.cs
index a622b5d00..a208f454f 100755
--- a/ArchiSteamFarm/Bot.cs
+++ b/ArchiSteamFarm/Bot.cs
@@ -1745,7 +1745,7 @@ namespace ArchiSteamFarm {
 		}
 
 		private void OnOfflineMessage(ArchiHandler.OfflineMessageCallback callback) {
-			if (callback == null) {
+			if (callback == null || callback.OfflineMessages == 0) {
 				return;
 			}
 
diff --git a/ArchiSteamFarm/JSON/Steam.cs b/ArchiSteamFarm/JSON/Steam.cs
index 40f4c7198..20fe6e0a5 100644
--- a/ArchiSteamFarm/JSON/Steam.cs
+++ b/ArchiSteamFarm/JSON/Steam.cs
@@ -79,8 +79,8 @@ namespace ArchiSteamFarm {
 						return;
 					}
 
-					uint result;
-					if (!uint.TryParse(value, out result)) {
+					ulong result;
+					if (!ulong.TryParse(value, out result)) {
 						return;
 					}
 
@@ -100,8 +100,8 @@ namespace ArchiSteamFarm {
 						return;
 					}
 
-					uint result;
-					if (!uint.TryParse(value, out result)) {
+					ulong result;
+					if (!ulong.TryParse(value, out result)) {
 						return;
 					}
 
@@ -127,8 +127,8 @@ namespace ArchiSteamFarm {
 						return;
 					}
 
-					uint result;
-					if (!uint.TryParse(value, out result)) {
+					ulong result;
+					if (!ulong.TryParse(value, out result)) {
 						return;
 					}
 
@@ -148,8 +148,8 @@ namespace ArchiSteamFarm {
 						return;
 					}
 
-					uint result;
-					if (!uint.TryParse(value, out result)) {
+					ulong result;
+					if (!ulong.TryParse(value, out result)) {
 						return;
 					}
 
@@ -337,7 +337,7 @@ namespace ArchiSteamFarm {
 			internal bool NewVersion { get; } = true;
 
 			[JsonProperty(PropertyName = "version", Required = Required.Always)]
-			internal int Version { get; } = 2;
+			internal byte Version { get; } = 2;
 
 			[JsonProperty(PropertyName = "me", Required = Required.Always)]
 			internal ItemList ItemsToGive { get; } = new ItemList();
diff --git a/ArchiSteamFarm/WebBrowser.cs b/ArchiSteamFarm/WebBrowser.cs
index c5b847e84..693d98f5c 100644
--- a/ArchiSteamFarm/WebBrowser.cs
+++ b/ArchiSteamFarm/WebBrowser.cs
@@ -213,7 +213,7 @@ namespace ArchiSteamFarm {
 				return null;
 			}
 
-			if (request.StartsWith("https://") && Program.GlobalConfig.ForceHttp) {
+			if (request.StartsWith("https://", StringComparison.Ordinal) && Program.GlobalConfig.ForceHttp) {
 				return null;
 			}