From 0197902953556d46f4c67f7d0ad1a31bb2ea116a Mon Sep 17 00:00:00 2001
From: onefang
Date: Sun, 21 Nov 2021 03:38:14 +1000
Subject: Don't crash if a DNS-RR mirror fails to resolve.

---
 apt-panopticon.lua | 30 ++++++++++++++++--------------
 1 file changed, 16 insertions(+), 14 deletions(-)

diff --git a/apt-panopticon.lua b/apt-panopticon.lua
index 06a051e..a524260 100755
--- a/apt-panopticon.lua
+++ b/apt-panopticon.lua
@@ -199,24 +199,26 @@ gatherIPs = function (host)
 		gatherIPs(m.FQDN)
 		IP[host][m.FQDN] = IP[m.FQDN]
 		-- Strip them out so we don't test them twice.
-		for l, n in pairs(IP[m.FQDN]) do
-		    if type(n) == 'table' then
-			for h, p in pairs(n) do
+		if nil ~= IP[m.FQDN] then
+		    for l, n in pairs(IP[m.FQDN]) do
+			if type(n) == 'table' then
+			    for h, p in pairs(n) do
+				for j, o in pairs(IP[host]['deb.roundr.devuan.org']) do
+				    if h == j then IP[host][m.FQDN][l][h] = nil end
+				end
+				o = 0
+				for j in pairs(IP[host][m.FQDN][l]) do o = o + 1 end
+				if 0 == o then IP[host][m.FQDN][l] = nil end
+			    end
+			else
 			    for j, o in pairs(IP[host]['deb.roundr.devuan.org']) do
-				if h == j then IP[host][m.FQDN][l][h] = nil end
+				if l == j then IP[host][m.FQDN][l] = nil end
 			    end
-			    o = 0
-			    for j in pairs(IP[host][m.FQDN][l]) do o = o + 1 end
-			    if 0 == o then IP[host][m.FQDN][l] = nil end
-			end
-		    else
-			for j, o in pairs(IP[host]['deb.roundr.devuan.org']) do
-			    if l == j then IP[host][m.FQDN][l] = nil end
 			end
+			o = 0
+			for j in pairs(IP[host][m.FQDN]) do o = o + 1 end
+			if 0 == o then IP[host][m.FQDN] = nil end
 		    end
-		    o = 0
-		    for j in pairs(IP[host][m.FQDN]) do o = o + 1 end
-		    if 0 == o then IP[host][m.FQDN] = nil end
 		end
 	    end
 	end
-- 
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