diff --git a/generator/MTProtoGenerator.cs b/generator/MTProtoGenerator.cs
index c9e71f0..f326c13 100644
--- a/generator/MTProtoGenerator.cs
+++ b/generator/MTProtoGenerator.cs
@@ -181,11 +181,11 @@ public class MTProtoGenerator : IIncrementalGenerator
 						break;
 					case "System.Collections.Generic.Dictionary<long, TL.User>":
 						readTL.AppendLine($"r.{member.Name} = reader.ReadTLDictionary<User>();");
-						writeTl.AppendLine($"writer.WriteTLVector({member.Name}.Values.ToArray());"); 
+						writeTl.AppendLine($"writer.WriteTLVector({member.Name}?.Values.ToArray());"); 
 						break;
 					case "System.Collections.Generic.Dictionary<long, TL.ChatBase>":
 						readTL.AppendLine($"r.{member.Name} = reader.ReadTLDictionary<ChatBase>();");
-						writeTl.AppendLine($"writer.WriteTLVector({member.Name}.Values.ToArray());");
+						writeTl.AppendLine($"writer.WriteTLVector({member.Name}?.Values.ToArray());");
 						break;
 					case "object":
 						readTL.AppendLine($"r.{member.Name} = reader.ReadTLObject();");
diff --git a/src/Client.cs b/src/Client.cs
index dc054e0..47644e5 100644
--- a/src/Client.cs
+++ b/src/Client.cs
@@ -1125,7 +1125,7 @@ namespace WTelegram
 			{
 				try
 				{
-					var users = await this.Users_GetUsers(InputUser.Self); // this calls also reenable incoming Updates
+					var users = await this.Users_GetUsers(InputUser.Self); // this call also reenable incoming Updates
 					var self = users[0] as User;
 					if (self.id == long.Parse(botToken.Split(':')[0]))
 					{
diff --git a/src/Encryption.cs b/src/Encryption.cs
index 4025d9e..501920b 100644
--- a/src/Encryption.cs
+++ b/src/Encryption.cs
@@ -247,10 +247,7 @@ namespace WTelegram
 			var rsaParam = rsa.ExportParameters(false);
 			if (rsaParam.Modulus[0] == 0) rsaParam.Modulus = rsaParam.Modulus[1..];
 			var publicKey = new RSAPublicKey { n = rsaParam.Modulus, e = rsaParam.Exponent };
-			using var memStream = new MemoryStream(280);
-			using (var writer = new BinaryWriter(memStream))
-				writer.WriteTLObject(publicKey);
-			var bareData = memStream.ToArray();
+			var bareData = publicKey.ToBytes();
 			var fingerprint = BinaryPrimitives.ReadInt64LittleEndian(sha1.ComputeHash(bareData, 4, bareData.Length - 4).AsSpan(12)); // 64 lower-order bits of SHA1
 			PublicKeys[fingerprint] = publicKey;
 			Helpers.Log(1, $"Loaded a public key with fingerprint {fingerprint:X}");
diff --git a/src/TL.cs b/src/TL.cs
index 7c4b65d..b0e2f00 100644
--- a/src/TL.cs
+++ b/src/TL.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.ComponentModel;
 using System.IO;
 using System.IO.Compression;
 using System.Linq;
@@ -48,6 +49,15 @@ namespace TL
 
 	public static class Serialization
 	{
+		[EditorBrowsable(EditorBrowsableState.Never)]
+		public static byte[] ToBytes<T>(this T obj) where T : IObject
+		{
+			using var ms = new MemoryStream(384);
+			using var writer = new BinaryWriter(ms);
+			writer.WriteTLObject(obj);
+			return ms.ToArray();
+		}
+
 		public static void WriteTLObject<T>(this BinaryWriter writer, T obj) where T : IObject
 		{
 			if (obj == null) { writer.WriteTLNull(typeof(T)); return; }