From 25a06f00714b6a1a4dd9307beae2c3408171b84d Mon Sep 17 00:00:00 2001
From: terrafrost <terrafrost@php.net>
Date: Wed, 26 Jul 2023 21:34:39 -0500
Subject: [PATCH] Math/PrimeField: fix for when garbage collection has wiped
 data

---
 phpseclib/Math/PrimeField/Integer.php | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/phpseclib/Math/PrimeField/Integer.php b/phpseclib/Math/PrimeField/Integer.php
index 748f9a49..ddb04912 100644
--- a/phpseclib/Math/PrimeField/Integer.php
+++ b/phpseclib/Math/PrimeField/Integer.php
@@ -312,8 +312,11 @@ class Integer extends Base
      */
     public function toBytes()
     {
-        $length = static::$modulo[$this->instanceID]->getLengthInBytes();
-        return str_pad($this->value->toBytes(), $length, "\0", STR_PAD_LEFT);
+        if (isset(static::$modulo[$this->instanceID])) {
+            $length = static::$modulo[$this->instanceID]->getLengthInBytes();
+            return str_pad($this->value->toBytes(), $length, "\0", STR_PAD_LEFT);
+        }
+        return $this->value->toBytes();
     }
 
     /**