From 99c192cd1d922d200bc7a1554dcaf603e095fe2c Mon Sep 17 00:00:00 2001
From: tomsellers <tomsellers@e0a8ed71-7df4-0310-8962-fdc924857419>
Date: Wed, 4 Jul 2012 17:58:21 +0000
Subject: [PATCH] Fix exception thrown in reverse-index when it is run again a
 host with no open ports.

/reverse-index.nse:112: bad argument #1 to 'pairs' (table expected, got nil)
---
 scripts/reverse-index.nse | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/scripts/reverse-index.nse b/scripts/reverse-index.nse
index 51248fe1b..f1e079684 100644
--- a/scripts/reverse-index.nse
+++ b/scripts/reverse-index.nse
@@ -136,6 +136,10 @@ end
 
 postaction = function()
 	local db = nmap.registry[SCRIPT_NAME]
+	if ( db == nil ) then
+		return false
+	end
+  
 	local results
 	local mode = stdnse.get_script_args("reverse-index.mode") or "horizontal"