Errors in MMBox-Module with PHP 5.4

Hello
my ISP is changing from PHP 5.3 to PHP 5.4 and customers can make some tests before switch.

I'v seen, that the website is working fine (I've deactivate in control panel / server the function of see error messages) but I still receive warning messages in the Multimediabox-Modul:

-- quote --

Warning: Creating default object from empty value in /home/hundespo/public_html/net/modules/mod_yj_multimediabox/helper.php on line 23

Warning: Creating default object from empty value in /home/hundespo/public_html/net/modules/mod_yj_multimediabox/mod_yj_multimediabox.php on line 23

-- quote end --

Can you help me and say what I've to do (before I've to switch to PHP 5.4)?

Additional Info: I'm using template Youvida and J 3.3 (just updated)

Many thanks for quick reply.
Bob

Are you sure your are posting in product assigned forum?: Yes

What is your CMS version?: WordPress 3.x

MySQL Version: N/A

PHP version: 5.x

Link to installation: Hundesport Pratteln

Have you edited any files? If yes tell us which ones.: No

Is this personal or client website?: Personal