PHP Fatal error: Errors in Error Log

The following is coming up multiple times in the error log
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[07-Sep-2019 08:38:56 UTC] PHP Fatal error: Uncaught Error: Call to undefined
function IP2Location\bcadd() in /wp-content/plugins/ip2location-country-blocker/class.IP2Location.php:992
Stack trace:
#0 /wp-content/plugins/ip2location-country-blocker/class.IP2Location.php(1611): IP2Location\Database::ipVersionAndNumber(‘2406:5a00:c83:b…’)
#1 /wp-content/plugins/ip2location-country-blocker/ip2location-country-blocker.php(2186): IP2Location\Database->lookup(‘2406:5a00:c83:b…’, 1001)
#2 /wp-content/plugins/ip2location-country-blocker/ip2location-country-blocker.php(1550): IP2LocationCountryBlocker->get_location(‘2406:5a00:c83:b…’, true)
#3 /wp-includes/class-wp-hook.php(286): IP2LocationCountryBlocker->check_block(”)
#4 /wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array)
#5 /wp-includes/plugin.php(465): WP_Hook->do_ac in /wp-content/plugins/ip2location-country-blocker/class.IP2Location.php on line 992
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What can I do to fix this?
Thank you for your time 🙂