**Problem:** When getting users for an IP address or IP address range, this occurs:
[5a54dbf916d70d373189953f] /wiki/Special:CheckUser InvalidArgumentException: Cannot create a user with no name, no ID, and no actor ID
Backtrace:
from /var/www/html/includes/user/UserFactory.php(263)
#0 /var/www/html/includes/user/UserFactory.php(199): MediaWiki\User\UserFactory->newFromAnyId()
#1 /var/www/html/extensions/CheckUser/src/CheckUser/Pagers/CheckUserGetUsersPager.php(193): MediaWiki\User\UserFactory->newFromUserIdentity()
#2 /var/www/html/extensions/CheckUser/src/CheckUser/Pagers/CheckUserGetUsersPager.php(167): MediaWiki\CheckUser\CheckUser\Pagers\CheckUserGetUsersPager->formatUserRow()
#3 /var/www/html/extensions/CheckUser/src/CheckUser/SpecialCheckUser.php(435): MediaWiki\CheckUser\CheckUser\Pagers\CheckUserGetUsersPager->getBody()
#4 /var/www/html/includes/specialpage/SpecialPage.php(719): MediaWiki\CheckUser\CheckUser\SpecialCheckUser->execute()
#5 /var/www/html/includes/specialpage/SpecialPageFactory.php(1669): MediaWiki\SpecialPage\SpecialPage->run()
#6 /var/www/html/includes/actions/ActionEntryPoint.php(504): MediaWiki\SpecialPage\SpecialPageFactory->executePath()
#7 /var/www/html/includes/actions/ActionEntryPoint.php(145): MediaWiki\Actions\ActionEntryPoint->performRequest()
#8 /var/www/html/includes/MediaWikiEntryPoint.php(199): MediaWiki\Actions\ActionEntryPoint->execute()
#9 /var/www/html/index.php(58): MediaWiki\MediaWikiEntryPoint->run()
#10 {main}
[95f3da58548e2a9b80b5b14d] /wiki/Special:CheckUser TypeError: MediaWiki\User\UserIdentityValue::__construct(): Argument #2 ($name) must be of type string, null given, called in /var/www/html/extensions/CheckUser/src/CheckUser/Pagers/CheckUserGetActionsPager.php on line 686
When getting actions, this error occurs:
Backtrace:
from /var/www/html/includes/user/UserIdentityValue.php(60)
#0 /var/www/html/extensions/CheckUser/src/CheckUser/Pagers/CheckUserGetActionsPager.php(686): MediaWiki\User\UserIdentityValue->__construct()
#1 /var/www/html/includes/pager/IndexPager.php(297): MediaWiki\CheckUser\CheckUser\Pagers\CheckUserGetActionsPager->preprocessResults()
#2 /var/www/html/includes/pager/IndexPager.php(571): MediaWiki\Pager\IndexPager->doQuery()
#3 /var/www/html/extensions/CheckUser/src/CheckUser/SpecialCheckUser.php(408): MediaWiki\Pager\IndexPager->getBody()
#4 /var/www/html/includes/specialpage/SpecialPage.php(719): MediaWiki\CheckUser\CheckUser\SpecialCheckUser->execute()
#5 /var/www/html/includes/specialpage/SpecialPageFactory.php(1669): MediaWiki\SpecialPage\SpecialPage->run()
#6 /var/www/html/includes/actions/ActionEntryPoint.php(504): MediaWiki\SpecialPage\SpecialPageFactory->executePath()
#7 /var/www/html/includes/actions/ActionEntryPoint.php(145): MediaWiki\Actions\ActionEntryPoint->performRequest()
#8 /var/www/html/includes/MediaWikiEntryPoint.php(199): MediaWiki\Actions\ActionEntryPoint->execute()
#9 /var/www/html/index.php(58): MediaWiki\MediaWikiEntryPoint->run()
#10 {main}