"Unhandled Runtime Error" when adding two links in one page

[DavtyanH]

Steps to reproduce

1. Run 'vital-demo' on Edit env and open the page where is possible to add two links on one page in different components on Edit mode( relative URL : "/styleguide/flow-container/, /styleguide/editors/, /styleguide/editors-monofont/" )
2. Add 2 links in different components (Rich Text Editor, Insert Component: Image, Text Editor, List)
3. Click on 'File' on the global context menu
4. Click on the 'Revert' button
5. Click on the 'Submit' icon
6. Click on the 'Close' icon

Expected result
All changes reverted successfully

Actual result
Shown 'Unhandled Runtime Error'.