JSON parsing issue when we have message sent with open connection

[iosnewbie2016]

Hi - Thanks for the code. The client project works fine when there is no message sent from server (our own server) with open connection. But when there is a message sent with open connection, it throws a json parsing error. Could you pls help?

SyntaxError: Unexpected token H in JSON at position 0
    at JSON.parse (<anonymous>)
    at deserializer (WebSocketSubject.js:12)
    at tryCatcher (tryCatch.js:6)
    at WebSocket.socket.onmessage [as __zone_symbol__ON_PROPERTYmessage] (WebSocketSubject.js:174)
    at WebSocket.wrapFn (zone.js:1188)
    at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:421)
    at Object.onInvokeTask (core.js:3815)
    at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:420)
    at Zone.push../node_modules/zone.js/dist/zone.js.Zone.runTask (zone.js:188)
    at ZoneTask.push../node_modules/zone.js/dist/zone.js.ZoneTask.invokeTask [as invoke] (zone.js:496)