From 833da775b6b87d4542e4b8495a1c52a651970a02 Mon Sep 17 00:00:00 2001
From: terrafrost <terrafrost@php.net>
Date: Sun, 13 Sep 2015 19:13:31 -0500
Subject: [PATCH] BigInteger: fix PHP7 error

$x = gmp_init(6); empty($x); demonstrates the problem
---
 phpseclib/Math/BigInteger.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/phpseclib/Math/BigInteger.php b/phpseclib/Math/BigInteger.php
index 14452dd0..4e86449b 100644
--- a/phpseclib/Math/BigInteger.php
+++ b/phpseclib/Math/BigInteger.php
@@ -3557,7 +3557,7 @@ class Math_BigInteger
 
         switch (MATH_BIGINTEGER_MODE) {
             case MATH_BIGINTEGER_MODE_GMP:
-                if (!empty($result->bitmask->value)) {
+                if ($this->bitmask !== false) {
                     $result->value = gmp_and($result->value, $result->bitmask->value);
                 }