--- a/mod_http_oauth2/mod_http_oauth2.lua	Mon Jul 31 07:28:09 2023 +0200
+++ b/mod_http_oauth2/mod_http_oauth2.lua	Fri Aug 04 01:11:01 2023 +0200
@@ -400,6 +400,8 @@
 		if is_device then
 			-- reconstruct the device_code
 			code = b64url(hashes.hmac_sha256(verification_key, device_state.user_code));
+		else
+			return oauth_error("invalid_request");
 		end
 	end
 	local ok = codes:set("authorization_code:" .. params.client_id .. "#" .. code, {