Hi Denis thanks for posting in the Community! So the issue is specific to when you attempt to insert that particular document? Can you try creating a copy of the document (File > Duplicate) and inserting the copy in Confluence instead to see if the issue persists? If that still doesn't resolve the issue can you please submit a support ticket through this form and include the full document URL and a screenshot of your javascript console when the issue occurs? This will help us take a closer look. Thanks!