Another "Trying to get property of non-object" bug due to distorted data structure

I'm using Views module to create a block for Gmap to show user location.
Assume that the block is finished and I want to change its parameters.
If I click to the "Setting" of the "Gmap" format, then click "Apply", the data structure will change, from

Array
(
    [0] => stdClass Object
        (
            [location_latitude] => 14.213268
            [location_longitude] => 121.006348
            [users_name] => admin
            [uid] => 1
            [users_created] => 1328843683
            [gmap_lat] => 14.213268
            [gmap_lon] => 121.006348
        )

)

to

Array
(
    [] => Array
        (
            [group] => 
            [rows] => Array
                (
                    [0] => stdClass Object
                        (
                            [location_latitude] => 14.213268
                            [location_longitude] => 121.006348
                            [users_name] => admin
                            [uid] => 1
                            [users_created] => 1328843683
                            [gmap_lat] => 14.213268
                            [gmap_lon] => 121.006348
                        )

                )

        )

)

(the $records variable), leading to this error

Trying to get property of non-object
Notice: Trying to get property of non-object in gmap_plugin_style_gmap->render