go to http://prototype.wikimedia.org/release-pl/Specjalna:Łączenie_kont
on a freshly created account

and you get this:

Internal error
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no wiki for rc_plwiki

Backtrace:

#0 /srv/org/wikimedia/prototype/wikis/rc/extensions/CentralAuth/SpecialMergeAccount.php(398): SpecialMergeAccount->foreignUserLink('rc_plwiki')
#1 [internal function]: SpecialMergeAccount->listWikiItem('rc_plwiki', '')
#2 /srv/org/wikimedia/prototype/wikis/rc/extensions/CentralAuth/SpecialMergeAccount.php(391): array_map(Array, Array, Array)
#3 /srv/org/wikimedia/prototype/wikis/rc/extensions/CentralAuth/SpecialMergeAccount.php(378): SpecialMergeAccount->formatList(Array, Array, Array)
#4 /srv/org/wikimedia/prototype/wikis/rc/extensions/CentralAuth/SpecialMergeAccount.php(369): SpecialMergeAccount->listWikis(Array, Array)
#5 /srv/org/wikimedia/prototype/wikis/rc/extensions/CentralAuth/SpecialMergeAccount.php(350): SpecialMergeAccount->listAttached(Array)
#6 /srv/org/wikimedia/prototype/wikis/rc/extensions/CentralAuth/SpecialMergeAccount.php(322): SpecialMergeAccount->showStatus(Array, Array)
#7 /srv/org/wikimedia/prototype/wikis/rc/extensions/CentralAuth/SpecialMergeAccount.php(77): SpecialMergeAccount->showCleanupForm()
#8 /srv/org/wikimedia/prototype/wikis/rc/includes/SpecialPage.php(580): SpecialMergeAccount->execute(NULL)
#9 /srv/org/wikimedia/prototype/wikis/rc/includes/Wiki.php(250): SpecialPage::executePath(Object(Title))
#10 /srv/org/wikimedia/prototype/wikis/rc/includes/Wiki.php(63): MediaWiki->handleSpecialCases(Object(Title), Object(OutputPage), Object(WebRequest))
#11 /srv/org/wikimedia/prototype/wikis/rc/index.php(114): MediaWiki->performRequestForTitle(Object(Title), NULL, Object(OutputPage), Object(User), Object(WebRequest))
#12 {main}

there is also a PHP error on top of the page:

<br />
<b>Warning</b>: array_map() [<a href='function.array-map'>function.array-map</a>]: An error occurred while invoking the map callback in <b>/srv/org/wikimedia/prototype/wikis/rc/extensions/CentralAuth/SpecialMergeAccount.php</b> on line <b>394</b><br />
(208.80.152.248)

Version: unspecified
Severity: major
URL: http://prototype.wikimedia.org/release-pl/Specjalna:Łączenie_kont