If a "web part error" is keeping a Web page from displaying content, use the web part maintenance page to remove the web part with the error.

If there isn't a link for the web part maintenance page in the error page, append ?contents=1 to the SharePoint web address and press the Enter or Return key. Check the checkbox next to the web part with the error and click the delete link.

For example, you're URL is https://utexas.sharepoint.com/sites/ABC. To bypass the faulty page, append ?contents=1

https://utexas.sharepoint.com/sites/ABC/?contents=1

Permalink: /utss/KAhome.do?number=KB0011740