Update mx_check.lua

diff --git a/src/plugins/lua/mx_check.lua b/src/plugins/lua/mx_check.lua
index 39ba95b0b5889cfc26cab41813fbdf34eab10576..bdd33a8e5c35335f57e3c28eb8268c38592037e2 100644 (file)
--- a/src/plugins/lua/mx_check.lua
+++ b/src/plugins/lua/mx_check.lua
@@ -50,6 +50,10 @@ local function mx_check(task)
     end
   end
 
+  if not mx_domain then
+    return
+  end
+
   local valid = false
 
   local function check_results(mxes)