diff --git a/src/danog/MadelineProto/Serialization.php b/src/danog/MadelineProto/Serialization.php
index 098e56751..54c207a8d 100644
--- a/src/danog/MadelineProto/Serialization.php
+++ b/src/danog/MadelineProto/Serialization.php
@@ -100,23 +100,28 @@ class Serialization
             \danog\MadelineProto\Logger::log('Lock acquired, deserializing');
 
             try {
-                $unserialized = file_get_contents($realpaths['file']);
+                $tounserialize = file_get_contents($realpaths['file']);
             } finally {
                 flock($realpaths['lockfile'], LOCK_UN);
                 fclose($realpaths['lockfile']);
             }
-            $tounserialize = str_replace('O:26:"danog\\MadelineProto\\Button":', 'O:35:"danog\\MadelineProto\\TL\\Types\\Button":', $unserialized);
-            foreach (['RSA', 'TL\\TLMethod', 'TL\\TLConstructor', 'MTProto', 'API', 'DataCenter', 'Connection', 'TL\\Types\\Button', 'TL\\Types\\Bytes', 'APIFactory'] as $class) {
-                class_exists('\\danog\\MadelineProto\\'.$class);
-            }
-            class_exists('\\Volatile');
             \danog\MadelineProto\Logger::class_exists();
 
             try {
                 $unserialized = unserialize($tounserialize);
             } catch (\danog\MadelineProto\Bug74586Exception $e) {
+                $tounserialize = str_replace('O:26:"danog\\MadelineProto\\Button":', 'O:35:"danog\\MadelineProto\\TL\\Types\\Button":', $unserialized);
+                foreach (['RSA', 'TL\\TLMethod', 'TL\\TLConstructor', 'MTProto', 'API', 'DataCenter', 'Connection', 'TL\\Types\\Button', 'TL\\Types\\Bytes', 'APIFactory'] as $class) {
+                    class_exists('\\danog\\MadelineProto\\'.$class);
+                }
+                class_exists('\\Volatile');
                 $unserialized = \danog\Serialization::unserialize($tounserialize);
             } catch (\danog\MadelineProto\Exception $e) {
+                $tounserialize = str_replace('O:26:"danog\\MadelineProto\\Button":', 'O:35:"danog\\MadelineProto\\TL\\Types\\Button":', $unserialized);
+                foreach (['RSA', 'TL\\TLMethod', 'TL\\TLConstructor', 'MTProto', 'API', 'DataCenter', 'Connection', 'TL\\Types\\Button', 'TL\\Types\\Bytes', 'APIFactory'] as $class) {
+                    class_exists('\\danog\\MadelineProto\\'.$class);
+                }
+                class_exists('\\Volatile');
                 Logger::log((string) $e, Logger::ERROR);
                 if (strpos($e->getMessage(), "Erroneous data format for unserializing 'phpseclib\\Math\\BigInteger'") === 0) {
                     $tounserialize = str_replace('phpseclib\\Math\\BigInteger', 'phpseclib\\Math\\BigIntegor', $unserialized);