diff --git a/web/multihost_http_server.anubis b/web/multihost_http_server.anubis
index 78eb5e3..0ccb4c5 100644
--- a/web/multihost_http_server.anubis
+++ b/web/multihost_http_server.anubis
@@ -1674,7 +1674,7 @@ public define List(Web_arg)
     String s,     //url_encoded string
     Int    start  //current position in string
   ) =
-  with first = read_name_or_value(s, start, start),
+  with first = if start >= length(s) then "" else read_name_or_value(s, start, start),
   with name = web_to_ascii(first, 0, []),
   if first = "" then 
     []
--
libgit2 0.21.4