Not really sure what causes (SMW or SF) the following error but while trying to access Special:FormEdit to one of our test items the following message appeared.
Notice: Undefined property: SMWWikiPageValue::$m_dataitem in D:\xampp\htdocs\lab\t1170\extensions\SemanticMediaWiki\includes\datavalues\SMW_DV_WikiPage.php on line 300
Fatal error: Call to a member function getNamespace() on a non-object in D:\xampp\htdocs\lab\t1170\extensions\SemanticMediaWiki\includes\datavalues\SMW_DV_WikiPage.php on line 300
If this is not a programming error at least the page should not end with Fatal error and instead give a more appropriate message on what is going wrong.
MediaWiki 1.17.0rc1
PHP 5.3.5 (apache2handler)
MySQL 5.5.8
SF (Version 2.2-alpha) (r90082)
SMW 1.6 (r90263)
Version: unspecified
Severity: normal