diff --git a/README.md b/README.md
index 9b1c06b..2e9c09b 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ Help me out for a couple of :beers:!
 [![Latest Stable Version](https://poser.pugx.org/Spomky-Labs/php-aes-gcm/v/stable.png)](https://packagist.org/packages/Spomky-Labs/php-aes-gcm)
 [![Total Downloads](https://poser.pugx.org/Spomky-Labs/php-aes-gcm/downloads.png)](https://packagist.org/packages/Spomky-Labs/php-aes-gcm)
 [![Latest Unstable Version](https://poser.pugx.org/Spomky-Labs/php-aes-gcm/v/unstable.png)](https://packagist.org/packages/Spomky-Labs/php-aes-gcm)
-[![License](https://poser.pugx.org/Spomky-Labs/php-aes-gcm/license.png)](https://packagist.org/packages/Spomky-Labs/php-aes-gcm)
+[![License](https://poser.pugx.org/Spomky-Labs/php-aes-gcm/license.png)](https://packagist.org/packages/Spomky-Labs/php-aes-gcm) [![GuardRails badge](https://badges.production.guardrails.io/Spomky-Labs/php-aes-gcm.svg)](https://www.guardrails.io)
 
 
 # The Release Process
diff --git a/src/AESGCM.php b/src/AESGCM.php
index ce7a7d7..7b7b1c5 100644
--- a/src/AESGCM.php
+++ b/src/AESGCM.php
@@ -192,7 +192,7 @@ public static function decryptWithAppendedTag($K, $IV, $Ciphertext = null, $A =
     private static function decryptWithPHP71($K, $key_length, $IV, $C, $A, $T)
     {
         $mode = 'aes-'.($key_length).'-gcm';
-        $P = openssl_decrypt(null === $C ? '' : $C, $mode, $K, OPENSSL_RAW_DATA, $IV, $T, $A);
+        $P = openssl_decrypt(null === $C ? '' : $C, $mode, $K, OPENSSL_RAW_DATA, $IV, $T, null === $A ? '' : $A);
         Assertion::true(false !== $P, 'Unable to decrypt or to verify the tag.');
 
         return $P;