PHP Warnings in an old 2.9.2 wordpress installation

I’ve asked to fix an error in an old wordpress 2.9.2 website (php 5.4 installed). The frontend works ok but in the backend, after successful login, there are PHP Warnings everywhere:

PHP Warning:  Creating default object from empty value in C:InetpubwwwrootLocalUseraaawp-adminincludestheme.php on line 19
PHP Warning:  Invalid argument supplied for foreach() in C:InetpubwwwrootLocalUseraaawp-contentpluginssitepress-multilingual-cmsmenudashboard-widget.php on line 94
PHP Warning:  Creating default object from empty value in C:InetpubwwwrootLocalUseraaawp-adminincludespost.php on line 342

I don’t want to update wordpress or do something big with this website. I just need to make these warnings go away. I tried to disable them with
WP_DEBUG, php.ini, .haccess. Nothing worked.

It’s strange that the warnings are displayed in administration pages only.
What can I do to fix this?

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