gerlos on "[Plugin: Polylang] Fatal error: Access to undeclared static property"

Hello,
Just updated Polylang on my website from version 1.4.5 to version 1.5 on Wordpress 3.9.1, and got this error when going to the home page:

Fatal error: Access to undeclared static property: PLL_Plugins_Compat::$max_posts in /home/gerlos/gerloseye.org/wp-content/plugins/polylang/include/plugins-compat.php on line 141

Disabling polylang plugin or restoring version 1.4.5 solves the problem.

https://wordpress.org/plugins/polylang/