FormatException: Useragent is invalid #1943

using RestSharp;

var options = new RestClientOptions("http://dummyjson.com/");
//options.UserAgent = "xxx";        //this works fine

options.UserAgent = "com.example.app/1.2.34(App; android 16) Build/1234";           //this does not work
var client = new RestClient(options);
var request = new RestRequest("products/1");
var response = await client.GetAsync(request);
Console.WriteLine(response.Content);

System.FormatException
  HResult=0x80131537
  Message=The format of value 'com.example.app/1.2.34(App; android 16) Build/1234' is invalid.
  Source=System.Net.Http
  StackTrace:
   at System.Net.Http.Headers.HttpHeaderParser.ParseValue(String value, Object storeValue, Int32& index) in /_/src/libraries/System.Net.Http/src/System/Net/Http/Headers/HttpHeaderParser.cs:line 72
   at System.Net.Http.Headers.HttpHeaders.ParseAndAddValue(HeaderDescriptor descriptor, HeaderStoreItemInfo info, String value) in /_/src/libraries/System.Net.Http/src/System/Net/Http/Headers/HttpHeaders.cs:line 989
   at RestSharp.RestClient.ConfigureHttpClient(HttpClient httpClient) in /home/runner/work/RestSharp/RestSharp/src/RestSharp/RestClient.cs:line 133
   at RestSharp.RestClient..ctor(RestClientOptions options, Action`1 configureDefaultHeaders) in /home/runner/work/RestSharp/RestSharp/src/RestSharp/RestClient.cs:line 64
   at Program.<<Main>$>d__0.MoveNext() in C:\Users\user\source\repos\F\F\Program.cs:line 8
   at Program.<Main>(String[] args)