WordPress Jquery cannot read property for offset in admin backend

I'm simply trying to get the top, left, etc position of an element when in the admin backend...

function my_backend_assets() {
    wp_enqueue_script(
        'my-editor-js',
        plugins_url( '/src/editor.js', dirname( __FILE__ ) ),
        array( 'jquery' ),
        filemtime( plugin_dir_path( __FILE__ ) . '/src/editor.js' )
    );
}
add_action( 'admin_enqueue_scripts', 'my_backend_assets', 99999 );

And my js

$( document ).load(function() {

  var $test = $(".my-div").offset();

  console.log( $test.top );

});

I get Uncaught TypeError: Cannot read property 'left' of undefined

Element my-div exists. I can log it it fine. The script loads in the backend. Jquery works... I don't understand why I can't get the offest() of elements.

from WordPress Jquery cannot read property for offset in admin backend