"PHP message: PHP Strict Standards: Non-static method PEAR::setError Handling

[xfib]

How can I fix this error from nginx/error.log

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2014/06/27 22:15:14 [error] 3362#0: *1088 FastCGI sent in stderr: "PHP message: PHP Strict Standards:  Non-static method PEAR::setError
Handling() should not be called statically in ***/program/include/iniset.php on line 131" while reading response header from upstream,
upstream: "fastcgi://unix:/var/lib/php5-fpm/ispconfig.soc 

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DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu 14.04 LTS"
php5-fpm

It shows up after this tutorial: http://www.howtoforge.com/using-roundcube-webmail-with-ispconfig-3-on-debian-wheezy-nginx