I've recently added an IP to my server, and since I get the following error on many of WHM pages:

This happens on any page that attempts to show IP addresses, such as the "List Accounts" or "Create a New Account" page. It's highly problematic since, I basically can't do anything with WHM anymore.
What can I do to fix it? Can I manually edit some config files to remove the problematic IP?
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Here's a copy / paste of the error message in the image above, if it's usedful:

This happens on any page that attempts to show IP addresses, such as the "List Accounts" or "Create a New Account" page. It's highly problematic since, I basically can't do anything with WHM anymore.
What can I do to fix it? Can I manually edit some config files to remove the problematic IP?
- - - Updated - - -
Here's a copy / paste of the error message in the image above, if it's usedful:
Code:
A fatal error or timeout occurred while processing this directive.
Can't use an undefined value as a HASH reference at /usr/local/cpanel/Cpanel/NAT/Object.pm line 54.
at /usr/local/cpanel/Cpanel/NAT/Object.pm line 54.
Cpanel::NAT::Object::load_file(Cpanel::NAT::Object=HASH(0x5abb240)) called at /usr/local/cpanel/Cpanel/NAT/Object.pm line 27
Cpanel::NAT::Object::new("Cpanel::NAT::Object") called at /usr/local/cpanel/Cpanel/NAT.pm line 20
Cpanel::NAT::cpnat() called at /usr/local/cpanel/Cpanel/NAT.pm line 29
Cpanel::NAT::get_public_ip("10.0.0.6") called at /usr/local/cpanel/Cpanel/SPF.pm line 99
Cpanel::SPF::make_spf_string() called at whostmgr/bin/whostmgr5.pl line 1894
main::_createacct_data() called at whostmgr/bin/whostmgr5.pl line 2046
main::createacct() called at whostmgr/bin/whostmgr5.pl line 256