Error message

• Notice: Trying to access array offset on value of type null in bootstrap_pager() (line 30 of /home/forever_root/public_html/sites/all/themes/bootstrap/theme/system/pager.func.php).
• Notice: Trying to access array offset on value of type null in bootstrap_pager() (line 70 of /home/forever_root/public_html/sites/all/themes/bootstrap/theme/system/pager.func.php).