`index.php?module=categories&type=admin&func=view` (you can check out the branch to see).

```
Error on Site name
The 'categories' module returned an error in 'view'.
Exception Trace
#0 Exception thrown in \core13\src\vendor\doctrine\dbal\lib\Doctrine\DBAL\DBALException.php, line 47.
#1 \core13\src\vendor\doctrine\orm\lib\Doctrine\ORM\Persisters\BasicEntityPersister.php(1599): Doctrine\DBAL\Connection->executeQuery('SELECT t0.name ...', Array, Array)
#2 \core13\src\vendor\doctrine\orm\lib\Doctrine\ORM\Persisters\BasicEntityPersister.php(1558): Doctrine\ORM\Persisters\BasicEntityPersister->getOneToManyStatement(Array, Object(Zikula\Core\Doctrine\Entity\Category))
#3 \core13\src\vendor\doctrine\orm\lib\Doctrine\ORM\UnitOfWork.php(2667): Doctrine\ORM\Persisters\BasicEntityPersister->loadOneToManyCollection(Array, Object(Zikula\Core\Doctrine\Entity\Category), Object(Doctrine\ORM\PersistentCollection))
#4 \core13\src\vendor\doctrine\orm\lib\Doctrine\ORM\PersistentCollection.php(224): Doctrine\ORM\UnitOfWork->loadCollection(Object(Doctrine\ORM\PersistentCollection))
#5 \core13\src\vendor\doctrine\orm\lib\Doctrine\ORM\PersistentCollection.php(576): Doctrine\ORM\PersistentCollection->initialize()
#6 \core13\src\lib\util\CategoryUtil.php(110): Doctrine\ORM\PersistentCollection->getIterator()
#7 \core13\src\lib\util\CategoryUtil.php(378): CategoryUtil::getCategoryByID(1)
#8 \core13\src\system\Categories\Controller\AdminController.php(64): CategoryUtil::getSubCategories(1, true, true, true, true, true)
#9 [internal function]: Categories\Controller\AdminController->viewAction(Array)
#10 \core13\src\lib\util\ModUtil.php(1078): call_user_func(Array, Array)
#11 \core13\src\lib\util\ModUtil.php(1160): ModUtil::exec('Categories', 'admin', 'view', Array, false, NULL)
#12 \core13\src\index.php(66): ModUtil::func('Categories', 'admin', 'view', Array)
#13 {main
```