--- a/plugins/mod_auth_internal_plain.lua	Tue Apr 04 01:26:26 2017 +0200
+++ b/plugins/mod_auth_internal_plain.lua	Tue Apr 04 01:26:33 2017 +0200
@@ -66,7 +66,7 @@
 
 function provider.get_sasl_handler()
 	local getpass_authentication_profile = {
-		plain = function(sasl, username, realm)
+		plain = function(_, username, realm)
 			local password = usermanager.get_password(username, realm);
 			if not password then
 				return "", nil;