obj.toJSON is not a function, Report ID:[2094499120]

"obj.toJSON is not a function" is shown in UI page, and all of methodes I can searched on Internet, but that don't work. The red mark still is there. How can I fix the problem?
  • Can you provide a Debug ID (different from a Report ID) for this happening?

    Does it still happen after a restart?

    If so, restart in Troubleshooting Mode (Help → "Restart in Troubleshooting Mode…”), which temporarily disables all plugins, and see if it still occurs.
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