unexpected session end

Some customizer settings need more capabilities. You can use customizer_preview_user_capabilities filter to add your desire capabilities which cause logged out.

Here is code: https://github.com/EmranAhmed/customizer-preview-for-theme-demo/blob/66651b7d57f27929397cdcde6d557cdbb3665233/customizer-preview-for-theme-demo.php#L374

Thank you

I checked your site but its worked fine. Could you check it on incognito browser or clear cache?

Hello Emran, yes i get the first logged out on chrome incognito browser

The i switch to normal browser and get the same result

All settings are ‘capability’ => ‘edit_theme_options’,

$wp_customize->add_setting( ‘et_divi[tablet_header_font_size]’, array(
‘default’ => et_get_option( ‘body_header_size’, ’30’ ),
‘type’ => ‘option’,
‘capability’ => ‘edit_theme_options’,
‘transport’ => ‘postMessage’,
‘sanitize_callback’ => ‘absint’,
) );