There are two ways:
1. change the extends of JdDatabaseAdapter from JDatabaseDriverMySQLi to JDatabaseDriverMySQLi_Fab in the file libraries/jdiction/database/driver/mysqli.php you maybe have to load the fab database driver file before with require_once(JPATH_SITE.'/components/com_fabrik/driver/mysqli_fab.php');
2. add the following code to the JdDatabaseAdapter class in libraries/jdiction/database/driver/mysqli.php
	public function replacePrefix($sql, $prefix = '#__')
	{
		$app = JFactory::getApplication();
		$package = $app->getUserStateFromRequest('com_fabrik.package', 'package', 'fabrik', 'cmd');
		if ($package == '')
		{
			$package = 'fabrik';
		}
		$sql = str_replace('{package}', $package, $sql);
		return parent::replacePrefix($sql, $prefix);
	}