From efc5bc9e403d9fd575912a3b57fd6dabb725d5fd Mon Sep 17 00:00:00 2001
From: Maayan Keshet <maayan@maayank.com>
Date: Thu, 23 May 2019 16:21:41 +0300
Subject: [PATCH] Fix bug in zero length order books handling

---
 js/bitfinex2.js | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/js/bitfinex2.js b/js/bitfinex2.js
index fd36ebd40b7ae..41429d173225c 100644
--- a/js/bitfinex2.js
+++ b/js/bitfinex2.js
@@ -619,7 +619,6 @@ module.exports = class bitfinex2 extends bitfinex {
 
     _websocketHandleOrderBook (contextId, symbol, msg) {
         let data = msg[1];
-        let firstElement = data[0];
         let timestamp = undefined;
         let dt = undefined;
         let length = msg.length;
@@ -628,7 +627,7 @@ module.exports = class bitfinex2 extends bitfinex {
             dt = this.iso8601 (timestamp);
         }
         let symbolData = this._contextGetSymbolData (contextId, 'ob', symbol);
-        if (Array.isArray (firstElement)) {
+        if (data.length == 0 || Array.isArray (data[0])) {
             // snapshot
             symbolData['ob'] = {
                 'bids': [],