diff --git a/src/VahterBanBot/Bot.fs b/src/VahterBanBot/Bot.fs
index 3528769..9d40f35 100644
--- a/src/VahterBanBot/Bot.fs
+++ b/src/VahterBanBot/Bot.fs
@@ -79,17 +79,17 @@ let aggregateBanResultInLogMsg
     let targetUserId = message.ReplyToMessage.From.Id
     let targetUsername = message.ReplyToMessage.From.Username
     let logMsgBuilder = StringBuilder()
-    %logMsgBuilder.AppendLine($"Vahter {vahterUsername}({vahterUserId}) banned {targetUsername} ({targetUserId})")
+    %logMsgBuilder.AppendLine($"Vahter {prependUsername vahterUsername}({vahterUserId}) banned {prependUsername targetUsername} ({targetUserId})")
     %logMsgBuilder.AppendLine($"Deleted {deletedUserMessages} messages in chats:")
 
     (logMsgBuilder, banResults)
     ||> Array.fold (fun (sb: StringBuilder) result ->
         match result with
         | Ok (chatUsername, chatId) ->
-            sb.AppendLine($"{chatUsername} ({chatId}) - OK")
+            sb.AppendLine($"{prependUsername chatUsername} ({chatId}) - OK")
         | Error (chatUsername, chatId, e) ->
-            logger.LogError($"Failed to ban user {targetUsername} ({targetUserId}) in chat {chatUsername} ({chatId})", e)
-            sb.AppendLine($"{chatUsername} ({chatId}) - FAILED. {e.Message}")
+            logger.LogError($"Failed to ban user {prependUsername targetUsername} ({targetUserId}) in chat {prependUsername chatUsername} ({chatId})", e)
+            sb.AppendLine($"{prependUsername chatUsername} ({chatId}) - FAILED. {e.Message}")
     )
     |> string
 
diff --git a/src/VahterBanBot/Program.fs b/src/VahterBanBot/Program.fs
index ab83f17..091edc9 100644
--- a/src/VahterBanBot/Program.fs
+++ b/src/VahterBanBot/Program.fs
@@ -83,8 +83,6 @@ let server = app.RunAsync()
 let telegramClient = app.Services.GetRequiredService<ITelegramBotClient>()
 
 let startLogMsg =
-    let prependUsername (s: string) =
-        if s.StartsWith("@") then s else "@" + s
     let sb = System.Text.StringBuilder()
     %sb.AppendLine("Bot started with following configuration")
     %sb.AppendLine("AllowedUsers:")
diff --git a/src/VahterBanBot/Utils.fs b/src/VahterBanBot/Utils.fs
index 381ab09..782c675 100644
--- a/src/VahterBanBot/Utils.fs
+++ b/src/VahterBanBot/Utils.fs
@@ -15,3 +15,10 @@ let getEnv name =
 let getEnvOr name defaultValue =
     let value = Environment.GetEnvironmentVariable name
     if value = null then defaultValue else value
+
+let prependUsername (s: string) =
+    if isNull s then
+        null
+    elif s.StartsWith "@" then
+        s
+    else "@" + s