Error in the Enfold theme

Hello,
We are having a problem with our site. We received an email from WordPress stating the error on the website, and that it was an error in the Enfold theme

Ett fel av typen E_ERROR uppstod på rad 489 i följande fil: D:\Webs\LocalUser\vivacuba.se\wp-content\themes\enfold\config-templatebuilder\avia-template-builder\php\shortcode-template.class.php. Felorsak: Uncaught Error: Cannot use string offset as an array in D:\Webs\LocalUser\vivacuba.se\wp-content\themes\enfold\config-templatebuilder\avia-template-builder\php\shortcode-template.class.php:489
Stack trace:
#0 D:\Webs\LocalUser\vivacuba.se\wp-content\themes\enfold\config-templatebuilder\avia-template-builder\php\shortcode-template.class.php(443): aviaShortcodeTemplate->create_sortable_editor_element(Array)
#1 D:\Webs\LocalUser\vivacuba.se\wp-content\themes\enfold\config-templatebuilder\avia-template-builder\php\template-builder.class.php(397): aviaShortcodeTemplate->prepare_editor_element()
#2 D:\Webs\LocalUser\vivacuba.se\wp-includes\class-wp-hook.php(287): AviaBuilder->js_template_editor_elements(”)
#3 D:\Webs\LocalUser\vivacuba.se\wp-includes\class-wp-hook.php(311): WP_Hook->apply_filters(”, Array)
#4 D:\Webs\LocalUser\vivacuba.se\wp-includes\plugin.php(478): WP_Hook->do_action(Array)
#5 D:\Webs\LocalUser\vivacuba.se\wp-includes\media-template.php(1465): do_action(‘print_media_tem…’)
#6 D:\Webs\LocalUse

Website details:
WordPress-version 5.4.2
Nuvarande tema: ljwebdesign (version 3.5.4.1472157441)
Nuvarande tillägg: (version )
PHP-version 7.3.3
Thank you very much in advance,
Hugs