SQL Error

WordPress database error You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘-906’ at line 1 for query SELECT orig_size-image_size FROM prefix_ewwwio_images LIMIT 2000, -906 made by do_action(‘wp_ajax_ewww_savings_loop’), call_user_func_array, ewww_image_optimizer_savings_loop

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