diff --git a/snappymail/v/0.0.0/app/libraries/MailSo/Base/Utils.php b/snappymail/v/0.0.0/app/libraries/MailSo/Base/Utils.php
index fd132d855..be1da5ff9 100644
--- a/snappymail/v/0.0.0/app/libraries/MailSo/Base/Utils.php
+++ b/snappymail/v/0.0.0/app/libraries/MailSo/Base/Utils.php
@@ -584,7 +584,7 @@ abstract class Utils
 
 	public static function UrlSafeBase64Decode(string $sValue) : string
 	{
-		return \base64_decode(\strtr($sValue, '-_', '+/'), '=');
+		return \base64_decode(\strtr($sValue, '-_', '+/'), true);
 	}
 
 	/**