1. MediaWiki version: 1.17alpha (r65773)
2. PHP version: 5.2.9 (apache2handler)
3. MySQL version: 5.1.33-community

If I add the $wgConfigureEditableSettings = array(); line on my LocalSettings file, in order to enable some features from the Configure extension 0.15.22 (r65773) I get the followin error message if I try to save (even without config changes):

Value for $wgDBtype setting is not in permitted (given: , permitted: MySQL, PostreSQL)

Backtrace:

1. 0 [...]w\extensions\Configure\specials\SpecialConfigure.php(23): ConfigurationPage->importFromRequest()
2. 1 [...]w\extensions\Configure\specials\ConfigurationPage.php(100): SpecialConfigure->doSubmit()
3. 2 [...]w\includes\SpecialPage.php(572): ConfigurationPage->execute(NULL)
4. 3 [...]w\includes\Wiki.php(259): SpecialPage::executePath(Object(Title))
5. 4 [...]w\includes\Wiki.php(67): MediaWiki->handleSpecialCases(Object(Title), Object(OutputPage), Object(WebRequest))
6. 5 [...]w\index.php(116): MediaWiki->performRequestForTitle(Object(Title), NULL, Object(OutputPage), Object(User), Object(WebRequest))
7. 6 {main}

Version: unspecified
Severity: blocker