Cant create guest password

Hi. I am testing the lastest version of Gallery 3 (Alpha 3) and got above error when want create guest password:

Runtime Message

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modules/user/controllers/admin_users.php [116]:

Trying to get property of non-object
Stack Trace

*

Admin_Users_Controller->edit_user( 1 )

* core/controllers/admin.php [49]:

call_user_func_array( Array
(
[0] => Admin_Users_Controller Object
(
[uri] => URI Object
(
)

[input] => Input Object
(
[use_xss_clean:protected] => 1
[magic_quotes_gpc:protected] => 1
[ip_address] =>
)

)

[1] => edit_user
)
, Array
(
[0] => 1
)
)

*

Admin_Controller->__call( users, Array
(
[0] => edit_user
[1] => 1
)
)

* kohana/core/Kohana.php [270]:

ReflectionMethod->invokeArgs( Admin_Controller Object
(
[theme:private] =>
[uri] => URI Object
(
)

[input] => Input Object
(
[use_xss_clean:protected] => 1
[magic_quotes_gpc:protected] => 1
[ip_address] =>
)

)
, Array
(
[0] => users
[1] => Array
(
[0] => edit_user
[1] => 1
)

)
)

*

Kohana::instance( )

* kohana/core/Event.php [209]:

call_user_func( Array
(
[0] => Kohana
[1] => instance
)
)

* kohana/core/Bootstrap.php [55]:

Event::run( system.execute )

* index.php [61]:

require( kohana/core/Bootstrap.php )

Loaded in 0.1381 seconds, using 4.41MB of memory. Generated by Kohana v2.3.2.