PHP error

Type: Notice

Message: Trying to access array offset on value of type bool

Filename: /home/jveqkonw/public_html/app/views/pages/page_publications_open.php

Row: 21

PHP error

Type: Notice

Message: Trying to access array offset on value of type null

Filename: /home/jveqkonw/public_html/app/views/pages/page_publications_open.php

Row: 21