From c37939b51cc01db39717c4b6954e53b6bcb2f12f Mon Sep 17 00:00:00 2001
From: Mikhail Galanin <mgalanin@mimecast.com>
Date: Fri, 21 Sep 2018 12:24:05 +0100
Subject: [Minor] Return nil if a random string used as selector

---
 lualib/lua_selectors.lua | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'lualib')

diff --git a/lualib/lua_selectors.lua b/lualib/lua_selectors.lua
index d33f6f0c7..7de1a10d8 100644
--- a/lualib/lua_selectors.lua
+++ b/lualib/lua_selectors.lua
@@ -743,7 +743,7 @@ exports.parse_selector = function(cfg, str)
   local parsed = {parser:match(str)}
   local output = {}
 
-  if not parsed then return nil end
+  if not parsed or not parsed[1] then return nil end
 
   -- Output AST format is the following:
   -- table of individual selectors
-- 
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