diff --git a/lns_server.lua b/lns_server.lua
index d659d55..c594541 100644
--- a/lns_server.lua
+++ b/lns_server.lua
@@ -109,7 +109,9 @@ while true do
         local auth_passed = false
         if require_auth then
             local authID = data[auth_server]
-            if authID ~= nil then
+            if request.token == nil then
+                rednet.send(client_id, "invalid auth", "lns")
+            elseif authID ~= nil then
                 rednet.send(authID, {
                     action = "token",
                     token = request.token