diff --git a/ncc/certs.py b/ncc/certs.py
index 0e3ab99..4d4594a 100644
--- a/ncc/certs.py
+++ b/ncc/certs.py
@@ -87,7 +87,7 @@ def generate_ssl(cfg: Path, domainstxt_file: Path) -> int:
         config_part = _remove_comments(c[1])
 
         for server_block in _get_server_blocks(config_part):
-            sn = next(re.finditer(SERVER_NAME_RE, server_block))
+            sn = next(re.finditer(SERVER_NAME_RE, server_block), None)
             if not sn:
                 continue