From dfdee4a9f3e968c5493f9e4166503624edfe5eb0 Mon Sep 17 00:00:00 2001
From: Philipp Gesang <phg@phi-gamma.net>
Date: Thu, 29 Oct 2015 08:03:33 +0100
Subject: [db] fix passing inverse format list

---
 src/luaotfload-database.lua | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

(limited to 'src/luaotfload-database.lua')

diff --git a/src/luaotfload-database.lua b/src/luaotfload-database.lua
index b871954..086f46f 100644
--- a/src/luaotfload-database.lua
+++ b/src/luaotfload-database.lua
@@ -1921,9 +1921,8 @@ end
 local p_font_filter
 
 do
-    local current_formats = { }
-
     local extension_pattern = function (list)
+        if type (list) ~= "table" or #list == 0 then return P(-1) end
         local pat
         for i=#list, 1, -1 do
             local e = list[i]
@@ -1940,6 +1939,8 @@ do
     --- small helper to adjust the font filter pattern (--formats
     --- option)
 
+    local current_formats = { }
+
     set_font_filter = function (formats)
 
         if not formats or type (formats) ~= "string" then
-- 
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