diff --git a/package/lean/mt/drivers/mt_wifi/files/mt7615.lua b/package/lean/mt/drivers/mt_wifi/files/mt7615.lua
index 36df646b8..9b69f0779 100644
--- a/package/lean/mt/drivers/mt_wifi/files/mt7615.lua
+++ b/package/lean/mt/drivers/mt_wifi/files/mt7615.lua
@@ -26,7 +26,7 @@ end
 function add_vif_into_lan(vif)
     local mtkwifi = require("mtkwifi")
     local wanif = mtkwifi.__trim(mtkwifi.read_pipe("uci get network.wan.ifname"))
-    if (string.match(vif, wanif)) then
+    if ('' ~= wanif and string.match(vif, wanif)) then
         return
     end
     local brvifs = mtkwifi.__trim(