Undefined array key "title"

[ReinerBforartists]

Describe the bug
My error log gets floodfilled with php error messages

To Reproduce
as the description says. Got error 'PHP message: PHP Warning:

[proxy_fcgi:error] [pid 296085:tid 296085] [client xxxxxxxxxxx ] AH01071: Got error 'PHP message: PHP Warning: Undefined array key "title" in /var/www/Reiner/wp-content/plugins/qtranslate-xt/src/widget.php on line 50'

Expected behavior
No errors in the log

Screenshots
No screenshot, i don't want to share IP adresses here.

Debug info

{
  "PHP_VERSION": "8.1.29",
  "WP_VERSION": "6.6.1",
  "QTX_VERSION": "3.15.2",
  "Plugins": [
    "All in One SEO 4.6.7.1",
    "Auto-hyperlink URLs 5.4.1",
    "Autoptimize 3.1.12",
    "Classic Editor 1.6.4",
    "qTranslate-XT 3.15.2",
    "Revision Control 2.3.2",
    "WP Cerber Security, Anti-spam & Malware Scan 9.0",
    "Cookie Information | Free WP GDPR Consent Plugin 2.0.23",
    "WP Super Cache 1.12.4"
  ]
}

{
  "default_language": "en",
  "enabled_languages": [
    "en",
    "de"
  ],
  "locale": {
    "en": "en_US",
    "de": "de_DE"
  },
  "date_format": {
    "en": "D-d-m-y",
    "de": "D-d-m-y"
  },
  "time_format": {
    "en": "h:i A",
    "de": "h:i A"
  },
  "url_mode": "2",
  "use_strftime": "3",
  "filter_options_mode": 0,
  "language_name_case": 0,
  "detect_browser_language": true,
  "hide_untranslated": false,
  "show_menu_alternative_language": false,
  "show_displayed_language_prefix": true,
  "show_alternative_content": false,
  "hide_default_language": true,
  "use_secure_cookie": false,
  "header_css_on": true,
  "text_field_filters": [],
  "disable_client_cookies": false,
  "url_info": {
    "cookie_lang_front": "de",
    "cookie_lang_admin": "en",
    "cookie_front_or_admin_found": true,
    "scheme": "https",
    "host": "www.reinerstilesets.de",
    "path": "/wp-admin/admin-ajax.php",
    "query": "action=admin_debug_info",
    "path-base": "",
    "wp-path": "/wp-admin/admin-ajax.php",
    "language_neutral_path": true,
    "http_referer": "https://www.reinerstilesets.de/wp-admin/options-general.php?page=qtranslate-xt",
    "referer_admin": true,
    "doing_front_end": false,
    "lang_cookie_admin": "en",
    "lang_admin": "en",
    "language": "en",
    "set_cookie": false
  },
  "language": "en",
  "editor_mode": 0,
  "highlight_mode": 1,
  "auto_update_mo": true,
  "hide_lsb_copy_content": false,
  "lsb_style": "simple-buttons.css",
  "config_files": [
    "./i18n-config.json"
  ],
  "custom_fields": [],
  "custom_field_classes": [],
  "post_type_excluded": [],
  "admin_enabled_modules": {
    "all-in-one-seo-pack": true,
    "acf": false,
    "events-made-easy": false,
    "jetpack": false,
    "google-site-kit": false,
    "gravity-forms": false,
    "woo-commerce": false,
    "wp-seo": false,
    "slugs": false
  },
  "translator": {},
  "qtrans_compatibility": false
}

{
  "cookies": [],
  "navigator": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36 OPR/112.0.0.0",
  "Javascript built-in RegExp: @@split": "supported"
}

Versions [REQUIRED!] ...

Latest version . See above

Additional context

I think that the PHP version is simply too high now for qtranslate XT. I would nevertheless be happy about a fix. The page runs now over 15 years multilingual. And at the frontend there is no problem to see.