HttpClient.GetAsync throw "APP Unexpectedly quit" in iOS.

Hi,

I have this problem in my app.

When I use HttpClient. GetAsync on OnStart Method of App throw "App Unexpectedly Quit" in iOS. I use the same method in other place and it works fine but in this method crash the app in iOS. In Android works fine too.

This is my code:

        public async Task<Response> Get<T>(string endpoint, string prefixtToken,string Istrick, string accessToken = null)
                {
                    try
                    {
                        var client = new HttpClient();
                        var autorizationToken = prefixtToken + accessToken;
                        if (accessToken != null || !string.IsNullOrEmpty(accessToken))
                            client.DefaultRequestHeaders.Add("Authorization", autorizationToken);

                        client.BaseAddress = new Uri(URLBASE);
                        var url = string.Format("{0}", endpoint);
                        var response = await client.GetAsync(url);

                        if (!response.IsSuccessStatusCode)
                        {
                            client.Dispose();
                            return new Response
                            {
                                IsSuccess = false,
                                Message = response.StatusCode.ToString(),
                            };
                        }

                        var result = await response.Content.ReadAsStringAsync();
                        var list = JsonConvert.DeserializeObject<T>(result);

                        client.Dispose();
                        return new Response
                        {
                            IsSuccess = true,
                            Message = "Ok",
                            Result = list,
                        };
                    }
                    catch (Exception ex)
                    {

                        return new Response
                        {
                            IsSuccess = false,
                            Message = ex.Message,
                        };
                    }
                }

This error isn't captured by try catch.