[TYPO3-english] Fatal Error since 4.6 on Plugins?

[Hendrik]

Hi,

if i want to edit an plugin content element in the backend since typo3 
4.6 i've got the following error:

Fatal Error: Argument 2 passed to 
t3lib_div::array_merge_recursive_overrule() must be an array, null 
given, called in /typo3_src-4.6.0/typo3/sysext/lang/lang.php on line 554 
and defined in /typo3/typo3_src-4.6.0/t3lib/class.t3lib_div.php line 1867

What's wrong?

Thanks!
Henny