Issue: Deletion of area not possible

In XenForo 2's configuration file, do you have debug mode enabled? You may get more specific errors if you set this to true.
In src/config.php:
I just tried deleting an area in debug mode and the error is generated by XF\Db\InvalidQueryException, so this might be related to issue 5598, which should be fixed in Alpha 2.

Ok, it seems that the issue is related to 5598 - thanks

XF\Db\InvalidQueryException: MySQL statement prepare error [1064]: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ') LIMIT 1' at line 1 in src/XF/Db/AbstractStatement.php at line 212
XF\Db\AbstractStatement->getException() in src/XF/Db/Mysqli/Statement.php at line 196
XF\Db\Mysqli\Statement->getException() in src/XF/Db/Mysqli/Statement.php at line 39
XF\Db\Mysqli\Statement->prepare() in src/XF/Db/Mysqli/Statement.php at line 54
XF\Db\Mysqli\Statement->execute() in src/XF/Db/AbstractAdapter.php at line 79
XF\Db\AbstractAdapter->query() in src/addons/vw/vw/_core/controller/db/xf2.php at line 148
vw_DB_Controller_XF2->query_read() in src/addons/vw/vw/_core/model/db/mysql/vw.php at line 25
vw_DB_MySQL_Model->select() in src/addons/vw/vw/_core/controller/cp/area/vw.php at line 756
vw_CP_Area_Controller->affected_counts() in src/addons/vw/vw/_core/controller/cp/area/vw.php at line 695
vw_CP_Area_Controller->delete() in src/addons/vw/vw/_core/controller/cp/area/vw.php at line 59
vw_CP_Area_Controller->execute() in src/addons/vw/vw/Admin/Controller/Wiki.php at line 90
vw\vw\Admin\Controller\Wiki->_actionIndex() in src/addons/vw/vw/Mvc/Dispatcher.php at line 30
vw\vw\Mvc\Dispatcher::dispatch() in src/addons/vw/vw/Admin/Controller/Wiki.php at line 51
vw\vw\Admin\Controller\Wiki->actionIndex() in src/XF/Mvc/Dispatcher.php at line 249
XF\Mvc\Dispatcher->dispatchClass() in src/XF/Mvc/Dispatcher.php at line 88
XF\Mvc\Dispatcher->dispatchLoop() in src/XF/Mvc/Dispatcher.php at line 41
XF\Mvc\Dispatcher->run() in src/XF/App.php at line 1934
XF\App->run() in src/XF.php at line 333
XF::runApp() in admin.php at line 13

Yeah, any query that involves modifying the existing area-tree, except adding a new area, is likely to fail before Alpha 2 because of: https://www.vaultwiki.org/issues/5598/

Ok, will wait for the Alpha2 ;-)