E_ERROR on page with video background on color section

Hi,

After updating to enfold 4.9.2.3 (from 4.8.8.1), pages with video background on color section generate error :

E_ERROR on line 865 of /…/wp-content/themes/enfold/config-templatebuilder/avia-shortcode-helpers/class-avia-slideshow.php.
Uncaught Error: Call to a member function get_subitem_styling_info() on null in /…/wp-content/themes/enfold/config-templatebuilder/avia-shortcode-helpers/class-avia-slideshow.php:865
Stack trace:
#0 /…/wp-content/themes/enfold/config-templatebuilder/avia-shortcode-helpers/class-avia-slideshow.php(579): avia_slideshow->html_advanced_slide()
#1 /…/wp-content/themes/enfold-child/shortcodes/section.php(1392): avia_slideshow->html()
#2 /…/wp-content/themes/enfold-child/shortcodes/section.php(1120): avia_new_section()
#3 /…/wp-content/themes/enfold/config-templatebuilder/avia-template-builder/php/class-shortcode-template.php(1142): avia_sc_section->shortcode_handler()
#4 /…/wp-includes/shortcodes.php(356): aviaShortcodeTemplate->shortcode_handler_prepare()
#5 [internal function]: do_shortcode_tag()
#6 /…/wp-includes/shortcodes.php(228): preg_replace_callback()
#7 /var/ww