diff --git a/snappymail/v/0.0.0/app/libraries/snappymail/crypt.php b/snappymail/v/0.0.0/app/libraries/snappymail/crypt.php
index 828f3b33a..4fd9b7b65 100644
--- a/snappymail/v/0.0.0/app/libraries/snappymail/crypt.php
+++ b/snappymail/v/0.0.0/app/libraries/snappymail/crypt.php
@@ -65,7 +65,7 @@ abstract class Crypt
 	{
 		if (3 === \count($data) && isset($data[0], $data[1], $data[2]) && \strlen($data[0])) {
 			$fn = "{$data[0]}Decrypt";
-			if (\method_exists(__CLASS__, $fn)) {
+			if (!\method_exists(__CLASS__, $fn)) {
 				Log::warning('Crypt', "{$fn} does not exists");
 			} else {
 				try {