diff --git a/src/danog/MadelineProto/Lua.php b/src/danog/MadelineProto/Lua.php
index 5c95da05..35c1c17e 100644
--- a/src/danog/MadelineProto/Lua.php
+++ b/src/danog/MadelineProto/Lua.php
@@ -159,7 +159,7 @@ class Lua
     public static function convert_objects(&$data)
     {
         array_walk_recursive($data, function (&$value, $key) {
-            if (is_object($value)) {
+            if (is_object($value) && !( $value instanceof \phpseclib\Math\BigInteger)) {
                 $newval = [];
                 foreach (get_class_methods($value) as $name) {
                     $newval[$name] = [$value, $name];