diff --git a/htdocs/core/lib/security.lib.php b/htdocs/core/lib/security.lib.php
index de6013a41f9..32891e4b825 100644
--- a/htdocs/core/lib/security.lib.php
+++ b/htdocs/core/lib/security.lib.php
@@ -195,7 +195,8 @@ function dolDecrypt($chain, $key = '')
 		$ciphering = $reg[1];
 		if (function_exists('openssl_decrypt')) {
 			if (empty($key)) {
-				return 'Error dolDecrypt decrypt key is empty';
+				dol_syslog("Error dolDecrypt decrypt key is empty", LOG_ERR);
+				return $chain;
 			}
 			$tmpexplode = explode(':', $reg[2]);
 			if (!empty($tmpexplode[1]) && is_string($tmpexplode[0])) {
@@ -204,7 +205,8 @@ function dolDecrypt($chain, $key = '')
 				$newchain = openssl_decrypt($tmpexplode[0], $ciphering, $key, 0, null);
 			}
 		} else {
-			$newchain = 'Error dolDecrypt function openssl_decrypt() not available';
+			dol_syslog("Error dolDecrypt decrypt key is empty", LOG_ERR);
+			return $chain;
 		}
 		return $newchain;
 	} else {