Undefined array key "default_language"

i am having this issue on my laravel app, am trying to implement change language middleware but i keep getting this error undefined array key. This is the middleware snippet

public function handle(Request $request, Closure $next): Response
    {
        $localeLanguage = \Session::get('languageChangeName');
        $defaultLanguage = getSuperAdminSettingValue()['default_language']->value;
        if (! isset($localeLanguage)) {
            if(!empty($defaultLanguage)){
                \App::setLocale($defaultLanguage);
                $defaultLanguage;
            }else{
                \App::setLocale('en');
            }
        } else {
            \App::setLocale($localeLanguage);
        }

        return $next($request);
    }
}

That error has occurred because the supposed array being returned by the getSuperAdminSettingValue method does not contain "default_language" key as part of the data in the array. I would suggest you assign the response from the method to a variable on a seperate line and then dd it to check what is returned before continuing with the rest of the implementation.

$superAdminSettingValues = getSuperAdminSettingValue();
/* 
 * The line below is to be deleted before proceeding to the next line
 * after confirming the variable is not an empty array and has the 
 * default_language as part of its data
 */
dd($superAdminSettingValues); 
$defaultLanguage = $superAdminSettingValues['default_language']->value;

I would encourage you to read on Laravel Localization. It is used to handle situations such as this in your laravel project. It involves using the command

php artisan lang:publish

to publish the language files from laravel in your project and setting a default language for your app in the config/app.php file. After which, I would approach the code a little differently using the following steps

• Publish the lang file with the command above

• Set the default locale in the config/app.php file by assigning a value to the APP_LOCALE key. As such, we would always have a value for default locale except if the value is not set in the config file. Then my code will be like this

   public function handle(Request $request, Closure $next): Response
   {
       /*
        * Get the locale language set in the session provided it has been 
        * set earlier somewhere else.
        */
        $localeLanguage = \Session::get('languageChangeName');
  
       /* 
        * Get the current locale value i.e app default locale
        */
       $currentLocale = \App::currentLocale();
  
       if (isset($localeLanguage)) {
           \App::setLocale($localeLanguage);
       } else {
           if (!isset($currentLocale)) {
               \App::setLocale('en');
           }
       }
  
       return $next($request);
   }