I assume that the hyperlink is to an external document, not to a location within your workbook.
If you hover the cursor over the hyperlink a Tooltip should give you the full path to the document. Does the document still exist in that location?
Samsung Galaxy S8 review
1995-2015: How technology has changed the world in 20 years
This poetic animation about monsters is illustrated in a Van Gogh painterly style
Apple predictions 2017
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.