diff --git a/src/Client.php b/src/Client.php
index 2350d14..3800675 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -60,7 +60,9 @@ class Client
         Files::checkOrCreateSessionFolder($file);
         $settings = array_replace_recursive((array) Config::getInstance()->get('telegram'), $settings);
         $instance = new MadelineProto\API($file, $settings);
-        $instance->unsetEventHandler();
+        if (self::isSessionLoggedIn($instance)) {
+            $instance->unsetEventHandler();
+        }
         $instance->async(true);
 
         $this->instances[$session] = $instance;
diff --git a/src/Logger.php b/src/Logger.php
index d778779..9e27c4a 100644
--- a/src/Logger.php
+++ b/src/Logger.php
@@ -162,6 +162,7 @@ class Logger extends AbstractLogger
             'file' => $exception->getFile(),
             'line' => $exception->getLine(),
             'code' => $exception->getCode(),
+            'backtrace' => array_slice($exception->getTrace(), 0, 3),
         ];
     }
 }
\ No newline at end of file