[2.0.0-RC-2H] Admin -> Revenue -> Undefined property via __get()

[JtouchMobile.com]

VM: 2.0.0-RC-2H
J: 1.7.1
PHP: 5.3

On the first time visit Revenue report page (administrator/index.php?option=com_virtuemart&view=report&task=basic) I got this notice:
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Notice: Undefined property via __get(): _date in /phpcenter/vm20/administrator/components/com_virtuemart/models/report.php on line 69 in /phpcenter/vm20/libraries/joomla/utilities/date.php on line 231 Notice: Undefined property via __get(): _date in /phpcenter/vm20/administrator/components/com_virtuemart/models/report.php on line 71 in /phpcenter/vm20/libraries/joomla/utilities/date.php on line 231
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This notice is not appear after select a filter to display/refresh the  report page