replace optional

Author: ishuen

src/http-client.js

@@ -328,7 +328,7 @@ const aggTrades = (pubCall, payload, endpoint = '/api/v3/aggTrades') =>
 
   // Convert the array to string to prevent unacceptable encoding
   const processSymbols = payload => {
-    if (payload?.symbols) {
+    if (payload && payload.hasOwnProperty('symbols')) {
       payload.symbols = `["${payload.symbols.join('"')}"]`
     }
   }