[TYPO3-english] htmlspecialchars error in class.tslib_content.php

[Tomasz Krawczyk]

I have lots of such errors in my PHP error log:

PHP Warning: htmlspecialchars() expects parameter 1 to be string, array given in D:\Sites\www.mysite.pl\typo3_src\typo3\sysext\cms\tslib\class.tslib_content.php on line 5891

It started at the end of August. 

If I add this: var_dump($LD['target']); in line 5889 I can see this at the beginning of the output:

string(6) "_blank" string(6) "_blank" string(6) "_blank" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) "" string(0) ""

I noticet this on TYPO3 version 4.5.23, IIS 6.0, PHP 5.3.17, multidomain but single language. I see no other problems with this site. Can anyone help me?

-- 
cheers
Tomek