Non-static method Centreon_Cache_Manager::getCacheFileName() called statically

[euidzero]

While importing exported configuration from nagios, STDERR is full of :

PHP Strict Standards: Non-static method Centreon_Cache_Manager::getCacheFileName() should not be called statically, assuming $this from incompatible context in /usr/local/centreon/www/modules/centreon-clapi/core/lib/Centreon/Object/Object.php on line 65

and
PHP Strict Standards: Non-static method Centreon_Cache_Manager::getCacheFileName() should not be called statically, assuming $this from incompatible context in /usr/local/centreon/www/modules/centreon-clapi/core/lib/Centreon/Object/Relation/Relation.php on line 93