From e2d81fa602056d0121fb8d0ec81ba491283d8bab Mon Sep 17 00:00:00 2001
From: Vsevolod Stakhov <vsevolod@rspamd.com>
Date: Mon, 29 Aug 2022 21:16:31 +0100
Subject: [PATCH] [Minor] Fix legacy string values in modify headers routine

Issue: #4246
---
 lualib/lua_mime.lua | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lualib/lua_mime.lua b/lualib/lua_mime.lua
index 02329badd..01a2fc95e 100644
--- a/lualib/lua_mime.lua
+++ b/lualib/lua_mime.lua
@@ -532,6 +532,8 @@ exports.modify_headers = function(task, hdr_alterations)
       for _,v in ipairs(hdr) do
         table.insert(add_tbl, {-1, v})
       end
+    elseif type(hdr) == 'string' then
+      table.insert(add_tbl, {-1, hdr})
     end
   end
   if hdr_alterations.order then
-- 
2.39.5