diff --git a/ArchiSteamFarm/Bot.cs b/ArchiSteamFarm/Bot.cs
index 2d4e7d99e..f0feb21ce 100755
--- a/ArchiSteamFarm/Bot.cs
+++ b/ArchiSteamFarm/Bot.cs
@@ -2482,7 +2482,7 @@ namespace ArchiSteamFarm {
 				return null;
 			}
 
-			ConcurrentHashSet<ulong> blacklist = BotDatabase.GetBlacklistedFromTradesSteamIDs();
+			IReadOnlyCollection<ulong> blacklist = BotDatabase.GetBlacklistedFromTradesSteamIDs();
 			return FormatBotResponse(blacklist.Count > 0 ? string.Join(", ", blacklist) : string.Format(Strings.ErrorIsEmpty, nameof(blacklist)));
 		}
 
@@ -2729,7 +2729,7 @@ namespace ArchiSteamFarm {
 				return null;
 			}
 
-			ConcurrentHashSet<uint> idleBlacklist = BotDatabase.GetIdlingBlacklistedAppIDs();
+			IReadOnlyCollection<uint> idleBlacklist = BotDatabase.GetIdlingBlacklistedAppIDs();
 			return FormatBotResponse(idleBlacklist.Count > 0 ? string.Join(", ", idleBlacklist) : string.Format(Strings.ErrorIsEmpty, nameof(idleBlacklist)));
 		}
 
@@ -2894,7 +2894,7 @@ namespace ArchiSteamFarm {
 				return null;
 			}
 
-			ConcurrentHashSet<uint> idleQueue = BotDatabase.GetIdlingPriorityAppIDs();
+			IReadOnlyCollection<uint> idleQueue = BotDatabase.GetIdlingPriorityAppIDs();
 			return FormatBotResponse(idleQueue.Count > 0 ? string.Join(", ", idleQueue) : string.Format(Strings.ErrorIsEmpty, nameof(idleQueue)));
 		}
 
diff --git a/ArchiSteamFarm/BotDatabase.cs b/ArchiSteamFarm/BotDatabase.cs
index 568a6c9ac..5aa4d4d6f 100644
--- a/ArchiSteamFarm/BotDatabase.cs
+++ b/ArchiSteamFarm/BotDatabase.cs
@@ -115,9 +115,9 @@ namespace ArchiSteamFarm {
 			}
 		}
 
-		internal ConcurrentHashSet<ulong> GetBlacklistedFromTradesSteamIDs() => BlacklistedFromTradesSteamIDs;
-		internal ConcurrentHashSet<uint> GetIdlingBlacklistedAppIDs() => IdlingBlacklistedAppIDs;
-		internal ConcurrentHashSet<uint> GetIdlingPriorityAppIDs() => IdlingPriorityAppIDs;
+		internal IReadOnlyCollection<ulong> GetBlacklistedFromTradesSteamIDs() => BlacklistedFromTradesSteamIDs;
+		internal IReadOnlyCollection<uint> GetIdlingBlacklistedAppIDs() => IdlingBlacklistedAppIDs;
+		internal IReadOnlyCollection<uint> GetIdlingPriorityAppIDs() => IdlingPriorityAppIDs;
 
 		internal bool IsBlacklistedFromIdling(uint appID) {
 			if (appID == 0) {