since Elementor version 2.0 beta.3 I got a trouble with REPEATER control, if default is left empty http://prntscr.com/iv8civ, id option is not saved in the post meta elementary data value, therefore I get notice error here http://prntscr.com/iv8g86 https://github.com/pojome/elementor/blob/release/2.0.0/includes/base/controls-stack.php#L1714