diff --git a/core/nginx/config.py b/core/nginx/config.py
index 1f06424b..0044772e 100755
--- a/core/nginx/config.py
+++ b/core/nginx/config.py
@@ -76,7 +76,7 @@ PROTO_ALL_BUT_HTTP=PROTO_MAIL.copy()
 PROTO_ALL_BUT_HTTP.extend(['443'])
 PROTO_ALL=PROTO_ALL_BUT_HTTP.copy()
 PROTO_ALL.extend(['80'])
-for item in args.get('PROXY_PROTOCOL', '').split(','):
+for item in args.get('PROXY_PROTOCOL', None).split(','):
     if item.isdigit():
         args[f'PROXY_PROTOCOL_{item}']=True
     elif item == 'mail':