# HG changeset patch
# User Matthew Wild <mwild1@gmail.com>
# Date 1321742430 0
# Node ID 70b5e533325dbc3c7df84e819625b5c7b8c61846
# Parent  33c149394dcb76f474b17a51d54189aa51acef43
util.debug: Fix potential traceback

diff -r 33c149394dcb -r 70b5e533325d util/debug.lua
--- a/util/debug.lua	Sat Nov 19 21:12:23 2011 +0500
+++ b/util/debug.lua	Sat Nov 19 22:40:30 2011 +0000
@@ -20,10 +20,12 @@
 
 local function get_upvalues_table(func)
 	local upvalues = {};
-	for upvalue_num = 1, math.huge do
-		local name, value = debug.getupvalue(func, upvalue_num);
-		if not name then break; end
-		table.insert(upvalues, { name = name, value = value });
+	if func then
+		for upvalue_num = 1, math.huge do
+			local name, value = debug.getupvalue(func, upvalue_num);
+			if not name then break; end
+			table.insert(upvalues, { name = name, value = value });
+		end
 	end
 	return upvalues;
 end