Uncaught TypeError: Cannot read properties of null (reading 'scrollHeight')

Hi All,

I've created a Support app using REACT and everything works perfectly except the scroll bar that appears when the app is loaded.

I get an error message that displays:

Uncaught TypeError: Cannot read properties of null (reading 'scrollHeight')  

When the app is loaded.

Info from my manifest file below:

  "defaultLocale": "en",

  "private": true,

  "location": {

    "support": {

      "ticket_sidebar": {

        "url": "assets/iframe.html",

        "flexible": true,

        "size": {

          "height": "500px"

        }

      },

      "new_ticket_sidebar": {

        "url": "assets/iframe.html",

        "flexible": true,

        "size": {

          "height": "500px"

        }

      }

    }

  },

  "version": "1.0",

  "frameworkVersion": "2.0"