Extbase MVC Framework

I was experimenting with the extension builder and changed afterwards ext_localconf.php in the newly created extension by adding configuration for a non-existing plugin (it's a testserver, so I wasn't thinking much):

Tx_Extbase_Utility_Extension::configurePlugin(
    $_EXTKEY,
    'anotherplugin',
    array('Event' => 'show'),
    array('Event' => 'create')
);

This caused frontend and backend of Typo3 to show me the error:

Fatal error: Call to a member function sL() on a non-object in …/typo3/sysext/extbase/Classes/Utility/Extension.php on line 191

The biggest problem here is that I couldn't get Typo3 to run again by just deleting the newly inserted lines in ext_localconf.php – I had to insert an

if($GLOBALS['LANG'] != null) {

in …/typo3/sysext/extbase/Classes/Utility/Extension.php on line 185 to be able to open the backend again and clear the cache.

I'd propose to patch such a condition there to be sure that a small error in a plugin can't block the whole page.

This is on Extbase 1.4.1, Typo3 4.6.1, and PHP 5.3.3-7.