[BUG] Uncaught TypeError: Cannot read property 'getUndoManager' of null at w.endOperation (ace.js:1)

[AgileFlex]

Environment

Please provide as many details as you can: Uncaught TypeError: Cannot read property 'getUndoManager' of null at w.endOperation (ace.js:1)

• Hosting type
  • [x] Form.io
  • [ ] Local deployment
    • Version:
• Formio.js version: "formiojs": "^4.9.5", | "react-formio": "^4.3.0",
• Frontend framework: "react": "^16.12.0"
• Browser: Chrome
• Browser version: 80.0.3987.149

Steps to Reproduce

1. Drag a component into the Formio Builder

Expected behavior

Observed behavior

Example

If possible, please provide a screenshot, live example (via JSFiddle or similar), and/or example code to help demonstrate the issue.

For code or form JSON, please enclose in a code block:

// your code here

[randallknutson]

This looks like a crash in the Ace editor. Can you see if it is a problem there instead of our platform?

[randallknutson]

Looks like things may have changed recently with ace. We may need to look into what is wrong. This is another issue with ace just reported. https://github.com/formio/formio.js/issues/2569

[AgileFlex]

Hello @randallknutson

The issue might be related to the fact that one js file is not loaded from the CDN:

ace.js:1 GET https://cdn.form.io/ace/1.4.8/theme-snow.js net::ERR_ABORTED 404

Opening the URL above we see:

• Code: NoSuchKey
• Message: The specified key does not exist.
• Key: ace/1.4.8/theme-snow.js
• RequestId: AF392064C6DBF8AC
• HostId: ZegNZjSdRygLYkWOYWWYD05nUJX8tDRqOFWJCcB6dmwfpGNb62GKqAHsFbVyUNNaFUWt7y3nOKQ=

Hopefully it helps you pinpoint the issue.

On the first load everything works fine. The issue can be replicated on dragging fields on the FormBuilder.

Thank you.

[travist]

theme-snow is not a valid theme for Ace. I believe this is probably caused by default wysiwyg settings (which were originally for the Quill editor) are somehow getting applied to Ace editor.

[AgileFlex]

@randallknutson @travist Thanks for investigating this bug. It does affect older versions of form.io too. Any progress on this one?

[jeriah-formio]

@AgileFlexAgency This item is currently being worked on by our dev team. We are hoping to have a fix out by the end of this week or early next week.

[TanyaGashtold]

I am closing the issue as it was created too long ago and there are no new comments here. I hope it was resolved. If not, please reopen it. Thanks!