Uncaught TypeError: Cannot read property 'class' of null

@ty wrote:

Hi, Team!
I built diagram and I’m getting this error:

    Uncaught TypeError: Cannot read property 'class' of null
    at Function.Z.fromJSON.Z.fromJson (go.js:1739)
    at HTMLDocument.<anonymous> (builder.js:675)
    at j (jquery.js:3099)
    at Object.fireWith [as resolveWith] (jquery.js:3211)
    at Function.ready (jquery.js:3417)
    at HTMLDocument.I (jquery.js:3433)

I’m getting this error when I’m running “funnelDiagram.model = go.Model.fromJson(json);”.
This is model json link: https://jsonformatter.org/ca8f1a

I"m sure all other code parts are correct. In my opinion, I’m getting this error because of json data(please focus on “notes” field and you can see that includes html-formatted string with css such as font-family, font-color, height etc. This data comes from user’s copy-paste formatted string from other source into text editor that I built and user saves diagram).
But strange thing is that I get this error on Ubuntu 16.04 server only, while it works well on localhost xampp server (on Windows).
I set “MEDIUMTEXT” as datatype for model json data field in mysql db.

Please help me with this. It’s killing my time.
Regards.

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