[TYPO3] Error: my fault or a bug?

[Andreas Koppa]

Hi,

I like to know if the following error is caused by my template or is just 
a minor bug.  

Typo3 4.0 Beta3.
At BE if I click "Info" at any page the popup window displays this error 
on top:

"Warning: Invalid argument supplied for foreach() in C:\xampplite\htdocs\typo3\show_item.php 
on line 501"

The same error is displayed at another computer using same setup.   Other 
than that everyting seems to be okay.

Thanks.