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Input wiki text:
=================
ISBN ISBN 1234
=================

Gives a PHP "Uninitialized string offset" error a 1.7 SVN wiki with E_ALL
enabled. Backtrace is as follows:
==============================
Notice: Uninitialized string offset: 0 in
/var/www/hosts/mediawiki/phase3/includes/Parser.php on line 3408
Call Stack
#	Function	Location
1	{main}()	/var/www/hosts/mediawiki/phase3/index.php:0
2	MediaWiki->initialize()	/var/www/hosts/mediawiki/phase3/index.php:135
3	MediaWiki->performAction()	/var/www/hosts/mediawiki/phase3/includes/Wiki.php:50
4	EditPage->submit()	/var/www/hosts/mediawiki/phase3/includes/Wiki.php:380
5	EditPage->edit()	/var/www/hosts/mediawiki/phase3/includes/EditPage.php:217
6	EditPage->showEditForm()	/var/www/hosts/mediawiki/phase3/includes/EditPage.php:379
7	EditPage->showPreview()	/var/www/hosts/mediawiki/phase3/includes/EditPage.php:1004
8	EditPage->getPreviewText()
/var/www/hosts/mediawiki/phase3/includes/EditPage.php:1244
9	Parser->parse()	/var/www/hosts/mediawiki/phase3/includes/EditPage.php:1401
10	Parser->internalParse()	/var/www/hosts/mediawiki/phase3/includes/Parser.php:288
11	Parser->doMagicLinks()	/var/www/hosts/mediawiki/phase3/includes/Parser.php:912
12	Parser->magicISBN()	/var/www/hosts/mediawiki/phase3/includes/Parser.php:926
==============================