PLX unavailable on Nov 15 (from 10am to 3pm)

Error message

• Warning: Trying to access array offset on value of type bool in simplenews_newsletter_defaults() (line 456 of /prod_service02/web-prod/hpc-web/sites/all/modules/simplenews/simplenews.module).
• Warning: Trying to access array offset on value of type null in simplenews_newsletter_defaults() (line 456 of /prod_service02/web-prod/hpc-web/sites/all/modules/simplenews/simplenews.module).