i have joomla 1.5.26 and K2 2.5.7 installed and was working fine also PHP Version is: 5.4.6

today I saw this message:

Warning: Creating default object from empty value in /home4/aru/public_html/administrator/components/com_k2/models/categories.php on line 474

what it means? how can I solve this?

thank you

i find a quick solution that may help some one in the future
i changed php version
from 5.4.6 to PHP 5.3
and warning dissapear
everything is working fine now ...

Hi. We are currently working on issues caused by PHP 5.4. The next release should fix this. Thanks for reporting.