WHOIS Lookup returns error

Hi
The WHOIS Lookup reports the following error:

Deprecated: The each() function is deprecated. This message will be suppressed on further calls in /home/example/public_html/wp-content/plugins/all-in-one-wp-security-and-firewall/lib/whois/whois.parser.php on line 344

Warning: Illegal string offset 'disclaimer' in /home/example/public_html/wp-content/plugins/all-in-one-wp-security-and-firewall/lib/whois/whois.parser.php on line 350

Fatal error: Uncaught Error: Cannot use string offset as an array in /home/example/public_html/wp-content/plugins/all-in-one-wp-security-and-firewall/lib/whois/whois.parser.php:350 Stack trace: #0 /home/example/public_html/wp-content/plugins/all-in-one-wp-security-and-firewall/lib/whois/whois.ip.arin.php(70): generic_parser_b(Array, Array, 'ymd', false, true) #1 /home/example/public_html/wp-content/plugins/all-in-one-wp-security-and-firewall/lib/whois/whois.client.php(469): arin_handler->parse(Array, '51.38.32.115') #2 /home/example/public_html/wp-content/plugins/all-in-one-wp-security-and-firewall/lib/whois/whois.ip.php(181): WhoisClient->Process(Array) #3 /home/example/public_html/wp-content/plugins/all-in-one-wp-security-and-firewall/lib/whois/whois.ip.php(129): ip_handler->parse_results(Array, Array, '51.38.32.115', true) #4 /home/example/public_html/wp-content/plugins/all-in-one-wp-security-and-firewall/lib/whois/whois.client.php(469): ip_handler->parse(Array, '51.38.32.115') #5 /home/example/public_html/wp-co in /home/example/public_html/wp-content/plugins/all-in-one-wp-security-and-firewall/lib/whois/whois.parser.php on line 350

Did anyone run into this as well?
Thanks for any information.
theo