Duplicate Error when "Rebuild Thread Information"

#1
Xenforo 1.1.0 beta1, clear install
php 5.3.8 over php-fpm

When i use on "Rebuild Thread Information" i get

Fatal error: Call to undefined function array_keys_exists() in /server/path/forum/library/XenForo/CacheRebuilder/Thread.php on line 60
 
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