centrifugo: Uncaught SyntaxError: Unexpected end of JSON input

Nothing has changed in my code since upgrading from v1.4.5 to v1.5.0, however, I’m getting this syntax error when sending message between clients:

The JSON is being broken somehow:

{
    "method": "join",
    "body": {
        "channel": "testsite:575e286967c52:sim1",
        "data": {
            "default_info": {
                "user_data": {
                    "id": 3,
                    "username": "sim1",
                    "rank": 100,
                    "zip": "56894",
                    "href": "http://www.testsite.com/users/sim1",
                    "last_login_at": "1467261409"
                }
            },
            "user": "3",
            "client": "855cdfc3-5dd6-4af4-b005-fc12653f780  //here string is not terminated and missing '}'

This prevents my messages from being sent.

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for my app I’m using: front-end: centrifuge-js back-end: centrifugo-1.5.0-linux-amd64