how i can solve this problem on wordpress

Stack trace:
#0 /home/bonusfunnel.com/public_html/wp-content/plugins/master-popups-lite/includes/class-functions.php(549): implode()
#1 /home/bonusfunnel.com/public_html/wp-content/plugins/master-popups-lite/includes/class-popups.php(272): MasterPopups\Includes\Functions::url_google_fonts()
#2 /home/bonusfunnel.com/public_html/wp-content/plugins/master-popups-lite/includes/class-popups.php(247): MasterPopups\Includes\Popups->get_link_google_fonts()
#3 /home/bonusfunnel.com/public_html/wp-includes/class-wp-hook.php(303): MasterPopups\Includes\Popups->add_popups_to_admin_footer()
#4 /home/bonusfunnel.com/public_html/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters()
#5 /home/bonusfunnel.com/public_html/wp-includes/plugin.php(470): WP_Hook->do_action()
#6 /home/bonusfunnel.com/public_html/wp-admin/admin-footer.php(78): do_action()
#7 /home/bonusfunnel.com/public_html/wp-admin/post.php(369): require_once('...')
#8 {main}
  thrown

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