Critical error when updating theme and plugins

Hi,

My client hasn’t not make any updates in a long time. Yesterday she tried to update the theme, plugins and wordpress version. She now is facing a critical error which seem to be generated by Template Library and Redux Framework module.

Here is the email she got from wordpress with the error details (it was received in French but I translated it):

WordPress version 5.9.2
Current theme: Basel Child (version 1.0.0)
Current plugin: Template Library and Redux Framework (version 4.3.12)
PHP version 7.3.32

Error details
======================
Une erreur de type E_ERROR a été causée dans la ligne 671 du fichier /home/gustavee/wordpress_www/wp-content/plugins/redux-framework/redux-core/framework.php. Message d’erreur : Uncaught Error: Call to a member function init() on null in /home/gustavee/wordpress_www/wp-content/plugins/redux-framework/redux-core/framework.php:671
Stack trace:
#0 /home/gustavee/wordpress_www/wp-content/plugins/redux-framework/redux-core/inc/classes/class-redux-enqueue.php(467): ReduxFramework->enqueue()
#1 /home/gustavee/wordpress_www/wp-content/plugins/redux-framework/redux-core/inc/classes/class-redux-enqueue.php(506): Redux_Enqueue->enqueue_field(Object(ReduxFramework), Array)
#2 /home/gustavee/wordpress_www/wp-content/plugins/redux-framework/redux-core/inc/classes/class-redux-enqueue.php(105): Redux_Enqueue->enqueue_fields(Object(ReduxFramework))
#3 /home/gustavee/wordpress_www/wp-content/plugins/redux-framework/redux-core/inc/extensions/metaboxes/class-redux-extension-metaboxes.php(560): Redux_Enqueue->init()
#4 /home/gustavee/wordpress_www/wp-includes/class-wp-hook.php(307): Redux_Extension_Metaboxes->enqueue(‘post.php’)
#5 /home/gustavee/wordpress_www/wp-includes/class-wp-hook.php(331): WP_Hook-

We tried deactivating the plugin but all the customization got lost (logo, colors, fonts, etc.).

Right now the website works but the homepage has bugs (navbar only clickable after scrolling, hero banner has disappeared, Product category mansonry grid is messed up).

We have a very small knowledge of coding. Could you help us fix this?

Thank you!