From b35aa232e8297f2f44e20036d4dbb56cccb0e79c Mon Sep 17 00:00:00 2001
From: AlinsRan <alinsran@apache.org>
Date: Mon, 6 Jul 2026 17:00:52 +0800
Subject: [PATCH] fix(dns): correct error() call in dns client initialization

error()'s second argument is the level, not a message part, so the
original error("...: ", err) dropped err (or raised a bad-argument
error). Concatenate err into the message instead.
---
 apisix/discovery/dns/init.lua | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/apisix/discovery/dns/init.lua b/apisix/discovery/dns/init.lua
index 601de0ebc9ee..197b7580d996 100644
--- a/apisix/discovery/dns/init.lua
+++ b/apisix/discovery/dns/init.lua
@@ -78,7 +78,7 @@ function _M.init_worker()
 
     local client, err = core.dns_client.new(opts)
     if not client then
-        error("failed to init the dns client: ", err)
+        error("failed to init the dns client: " .. (err or "unknown"))
         return
     end