Error message

• Warning: Trying to access array offset on value of type null in bootstrap_pager() (line 53 of /usr/home/wsadowicz/domains/mapawsparciaspoldzielni.pl/public_html/sites/all/themes/bootstrap/templates/system/pager.func.php).
• Warning: Trying to access array offset on value of type null in bootstrap_pager() (line 95 of /usr/home/wsadowicz/domains/mapawsparciaspoldzielni.pl/public_html/sites/all/themes/bootstrap/templates/system/pager.func.php).