From 7ada812f7d9227264efc9ddd37f4e4db60c6d235 Mon Sep 17 00:00:00 2001
From: maryia-binary <maryia@binary.com>
Date: Tue, 20 Dec 2022 18:14:21 +0300
Subject: [PATCH] fix: blank page caused by disallowed synthetics

---
 src/javascript/app/common/active_symbols.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/javascript/app/common/active_symbols.js b/src/javascript/app/common/active_symbols.js
index 4959fa3a39bfe..cdafd3a1cfba7 100644
--- a/src/javascript/app/common/active_symbols.js
+++ b/src/javascript/app/common/active_symbols.js
@@ -26,7 +26,7 @@ const submarket_order = {
 };
 
 const ActiveSymbols = (() => {
-    const groupBy = (xs, key) => (
+    const groupBy = (xs = [], key) => (
         xs.reduce((rv, x) => {
             (rv[x[key]] = rv[x[key]] || []).push(x);
             return rv;