Fatal error: Uncaught TypeError: Cannot access offset of type string

[l1z0b]

After updating my server from PHP 7.4 to PHP 8.2 I receive the following error:

Fatal error: Uncaught TypeError: Cannot access offset of type string on string in web/wp-content/plugins/qtranslate-xt/src/language_blocks.php:439

Stack trace:
#0 web/wp-content/plugins/qtranslate-xt/src/frontend.php(445): qtranxf_use_content()
#1 web/wp-content/plugins/qtranslate-xt/src/frontend.php(480): qtranxf_translate_object_property()
#2 web/wp-content/plugins/qtranslate-xt/src/frontend.php(508): qtranxf_translate_post()
#3 web/wp-includes/class-wp-hook.php(324): qtranxf_postsFilter()
#4 web/wp-includes/plugin.php(256): WP_Hook->apply_filters()
#5 web/wp-includes/class-wp-query.php(3530): apply_filters_ref_array()
#6 web/wp-includes/class-wp-query.php(3824): WP_Query->get_posts()
#7 web/wp-includes/post.php(6118): WP_Query->query()
#8 web/wp-includes/post-template.php(719): get_pages()
#9 web/wp-includes/post-template.php(620): get_body_class()
#10 web/wp-content/themes/hotelbramante/header.php(280): body_class()
#11 web/wp-includes/template.php(790): require_once('...')
#12 web/wp-includes/template.php(725): load_template()
#13 web/wp-includes/general-template.php(48): locate_template()
#14 web/wp-content/themes/hotelbramante/page-homepage.php(3): get_header()
#15 web/wp-includes/template-loader.php(106): include('...')
#16 web/wp-blog-header.php(19): require_once('...')
#17 web/index.php(17): require('...')
#18 {main} thrown in web/wp-content/plugins/qtranslate-xt/src/language_blocks.php on line 439

My website has Wordpress 6.4.3 and it has qtranslate-xt 3.15.2, I can't find how to fix this problem, before the PHP update everything worked fine.