Fix Uncaught TypeError: Cannot read property 'data' of undefined.

[vikas5914]

On the error, the event has the following structure.

{type: "PusherError", data: {…}}
data: {code: 1006, message: undefined}
type: "PusherError"
__proto__: Object

Since we are trying to access the error key inside the event. it was throwing the undefined error.