(I reproduce in version 4.7.8 and 4.5.8)

To reproduce with firefox

How to reproduce

• go to the demo: https://demo.ametys.org/nightly-intranet-cms/www/index.html on the demo site charter
• insert the service directory links with the following parameters
  
• go to the preview
• add a custom link
• remove link
  When deleting an error is displayed. The link is not deleted