diff --git a/src/danog/MadelineProto/Session.php b/src/danog/MadelineProto/Session.php
index a6ec818f..fcb59825 100755
--- a/src/danog/MadelineProto/Session.php
+++ b/src/danog/MadelineProto/Session.php
@@ -132,6 +132,9 @@ Slv8kg9qv1m6XHVQY3PnEw+QQtqSIXklHwIDAQAB
         }
         $packet_length = $this->struct->unpack('<I', $packet_length_data)[0];
         $packet = $this->sock->read($packet_length - 4);
+        if ($packet_length == 4) {
+            throw new Exception("Server response error: " . $this->struct->unpack('<I', $packet)[0]);
+        }
         if (!($this->newcrc32($packet_length_data.substr($packet, 0, -4)) == $this->struct->unpack('<I', substr($packet, -4))[0])) {
             throw new Exception('CRC32 was not correct!');
         }
@@ -156,6 +159,7 @@ Slv8kg9qv1m6XHVQY3PnEw+QQtqSIXklHwIDAQAB
             $message_data_length = $this->struct->unpack('<I', substr($decrypted_data, 28, 32 - 28)) [0];
             $data = substr($decrypted_data, 32, (32 + $message_data_length) - 32);
         } else {
+            DebugFunctions::hex_dump($packet);
             throw new Exception('Got unknown auth_key id');
         }
 
@@ -233,7 +237,9 @@ Slv8kg9qv1m6XHVQY3PnEw+QQtqSIXklHwIDAQAB
 
         // req_DH_params
         $this->log->log('Starting Diffie Hellman key exchange');
+        
         $server_dh_params = $this->method_call('req_DH_params', ['nonce' => $nonce, 'server_nonce' => $server_nonce, 'p' => $p_bytes, 'q' => $q_bytes, 'public_key_fingerprint' => $public_key_fingerprint, 'encrypted_data' => $encrypted_data]);
+
         if ($nonce != $server_dh_params['nonce']) {
             throw new Exception('Handshake: wrong nonce.');
         }
diff --git a/src/danog/MadelineProto/TL/TL.php b/src/danog/MadelineProto/TL/TL.php
index b58a486f..3a5eb1ad 100644
--- a/src/danog/MadelineProto/TL/TL.php
+++ b/src/danog/MadelineProto/TL/TL.php
@@ -60,10 +60,16 @@ class TL
             throw new Exception('Could not extract type: '.$type_);
         }
         $bytes_io .= \danog\PHP\Struct::pack('<i', $tl_method->id);
-        foreach ($tl_method->params as $arg) {
-            $bytes_io .= $this->serialize_param($arg['type'], $kwargs[$arg['name']]);
+        if (count(array_filter(array_keys($kwargs), 'is_string')) > 0) {
+            foreach ($tl_method->params as $arg) {
+                $bytes_io .= $this->serialize_param($arg['type'], $kwargs[$arg['name']]);
+            }
+        } else {
+            $argcount = 0;
+            foreach ($tl_method->params as $arg) {
+                $bytes_io .= $this->serialize_param($arg['type'], $kwargs[$argcount++]);
+            }
         }
-
         return $bytes_io;
     }