diff --git a/src/Helpers.TL.cs b/src/Helpers.TL.cs
index 84047c0..7a412d1 100644
--- a/src/Helpers.TL.cs
+++ b/src/Helpers.TL.cs
@@ -260,9 +260,9 @@ namespace TL
 	}
 
 	partial class Peer { public abstract long ID { get; }  }
-	partial class PeerUser { public override long ID => user_id; }
-	partial class PeerChat { public override long ID => chat_id; }
-	partial class PeerChannel { public override long ID => channel_id; }
+	partial class PeerUser { public override long ID => user_id; public override string ToString() => "user " + user_id; }
+	partial class PeerChat { public override long ID => chat_id; public override string ToString() => "chat " + chat_id; }
+	partial class PeerChannel { public override long ID => channel_id; public override string ToString() => "channel " + channel_id; }
 
 	partial class JsonObjectValue { public override string ToString() => $"{HttpUtility.JavaScriptStringEncode(key, true)}:{value}"; }
 	partial class JsonNull { public override string ToString() => "null"; }
diff --git a/src/Session.cs b/src/Session.cs
index 8ee577f..79243aa 100644
--- a/src/Session.cs
+++ b/src/Session.cs
@@ -86,7 +86,14 @@ namespace WTelegram
 			encryptor.TransformBlock(utf8Json, 0, utf8Json.Length & ~15, output, 48);
 			utf8Json.AsSpan(utf8Json.Length & ~15).CopyTo(finalBlock);
 			encryptor.TransformFinalBlock(finalBlock, 0, utf8Json.Length & 15).CopyTo(output.AsMemory(48 + utf8Json.Length & ~15));
-			File.WriteAllBytes(_pathname, output);
+			if (!File.Exists(_pathname))
+				File.WriteAllBytes(_pathname, output);
+			else
+			{
+				string tempPathname = _pathname + ".tmp";
+				File.WriteAllBytes(tempPathname, output);
+				File.Replace(tempPathname, _pathname, null);
+			}
 		}
 
 		internal (long msgId, int seqno) NewMsg(bool isContent)