Protect the node.js against empty fen.

diff --git a/server/hash-lookup.js b/server/hash-lookup.js
index 0e7ee52b0fc38d7d5798548fecf6e993dd46e1ea..b9d5f008250a3a0fe479bd01552aeed3006e3395 100644 (file)
--- a/server/hash-lookup.js
+++ b/server/hash-lookup.js
@@ -16,7 +16,7 @@ var init = function(servers) {
 exports.init = init;
 
 var handle_request = function(fen, response) {
 exports.init = init;
 
 var handle_request = function(fen, response) {

-       if (!board.validate_fen(fen).valid) {
+       if (fen === undefined || fen === null || fen === '' || !board.validate_fen(fen).valid) {

                response.writeHead(400, {});
                response.end();
                return;
                response.writeHead(400, {});
                response.end();
                return;