[Gelöst] An error of type E_ERROR was caused in line 3937

Hi, I can't access to WP backend anymore.
I get an error message that there is a problem with WPML Multilingual CMS.
So I can login only in recovery mode and I see the attacjed screenshot and this error log:

An error of type E_ERROR was caused in line 3937 of the file /www/shopbettersleeplabit_790/public/wp-content/plugins/sitepress-multilingual-cms/sitepress.class.php. Error message: Uncaught TypeError: Illegal offset type in isset or empty in /www/shopbettersleeplabit_790/public/wp-content/plugins/sitepress-multilingual-cms/sitepress.class.php:3937 Stack trace: #0 /www/shopbettersleeplabit_790/public/wp-content/plugins/sitepress-multilingual-cms/classes/translations/class-wpml-post-element.php(54): SitePress->is_display_as_translated_post_type(Object(WP_Error)) #1 /www/shopbettersleeplabit_790/public/wp-content/plugins/sitepress-multilingual-cms/classes/url-handling/wpml-url-filters.class.php(445): WPML_Post_Element->is_display_as_translated() #2 /www/shopbettersleeplabit_790/public/wp-content/plugins/sitepress-multilingual-cms/classes/url-handling/wpml-url-filters.class.php(238): WPML_URL_Filters->is_display_as_translated_mode(Object(WPML_Post_Element)) #3 /www/shopbettersleeplabit_790/public/wp-includes/class-wp-hook.php(310): WPML_URL_Filters->permalink_filter('versteckter Link...', Object(WP_Post)) #4 /www/shopbettersleeplabit_790/public/wp-includes/plugin.php(205): WP_Hook->apply_filters('versteckter Link...', Array) #5 /www/shopbettersleeplabit_790/public/wp-includes/link-template.php(371): apply_filters('post_type_link', 'versteckter Link...', Object(WP_Post), false, false) #6 /www/shopbettersleeplabit_790/public/wp-includes/link-template.php(201): get_post_permalink(Object(WP_Post), false, false) #7 /www/shopbettersleeplabit_790/public/wp-content/plugins/google-site-kit/includes/Core/Assets/Assets.php(1099): get_permalink(Object(WP_Post)) #8 /www/shopbettersleeplabit_790/public/wp-content/plugins/google-site-kit/includes/Core/Assets/Assets.php(728): GoogleSite_KitCoreAssetsAssets->get_product_base_paths() #9 /www/shopbettersleeplabit_790/public/wp-content/plugins/google-site-kit/includes/Core/Assets/Assets.php(357): GoogleSite_KitCoreAssetsAssets->get_inline_base_data() #10 [internal function]: GoogleSite_KitCoreAssetsAssets->GoogleSite_KitCoreAssets{closure}('googlesitekit-b...') #11 /www/shopbettersleeplabit_790/public/wp-content/plugins/google-site-kit/includes/Core/Assets/Script_Data.php(51): call_user_func(Object(Closure), 'googlesitekit-b...') #12 [internal function]: GoogleSite_KitCoreAssetsScript_Data->GoogleSite_KitCoreAssets{closure}('googlesitekit-b...') #13 /www/shopbettersleeplabit_790/public/wp-content/plugins/google-site-kit/includes/Core/Assets/Asset.php(129): call_user_func(Object(Closure), 'googlesitekit-b...') #14 /www/shopbettersleeplabit_790/public/wp-content/plugins/google-site-kit/includes/Core/Assets/Assets.php(1017): GoogleSite_KitCoreAssetsAsset->before_print() #15 /www/shopbettersleeplabit_790/public/wp-content/plugins/google-site-kit/includes/Core/Assets/Assets.php(1026): GoogleSite_KitCoreAssetsAssets->run_before_print_callbacks(Object(WP_Scripts), Array) #16 /www/shopbettersleeplabit_790/public/wp-content/plugins/google-site-kit/includes/Core/Assets/Assets.php(1026): GoogleSite_KitCoreAssetsAssets->run_before_print_callbacks(Object(WP_Scripts), Array) #17 /www/shopbettersleeplabit_790/public/wp-content/plugins/google-site-kit/includes/Core/Assets/Assets.php(1026): GoogleSite_KitCoreAssetsAssets->run_before_print_callbacks(Object(WP_Scripts), Array) #18 /www/shopbettersleeplabit_790/public/wp-content/plugins/google-site-kit/includes/Core/Assets/Assets.php(156): GoogleSite_KitCoreAssetsAssets->run_before_print_callbacks(Object(WP_Scripts), Array) #19 /www/shopbettersleeplabit_790/public/wp-includes/class-wp-hook.php(308): GoogleSite_KitCoreAssetsAssets->GoogleSite_KitCoreAssets{closure}('') #20 /www/shopbettersleeplabit_790/public/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(NULL, Array) #21 /www/shopbettersleeplabit_790/public/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #22 /www/shopbettersleeplabit_790/public/wp-admin/admin-header.php(146): do_action('admin_print_scr...') #23 /www/shopbettersleeplabit_790/public/wp-admin/index.php(137): require_once('/www/shopbetter...') #24 {main} thrown

Any idea?
Thank you