[NullReferenceException: Object reference not set to an instance of the object.]
   iAnywhere.Data.SQLAnywhere.SAConnection.CalledByEntityFramework() +263
   iAnywhere.Data.SQLAnywhere.SAConnection.get_ConnectionString() +538
   Dapper.Identity..ctor(String sql, Nullable`1 commandType, IDbConnection connection, Type type, Type parametersType, Type[] otherTypes) +73
   Dapper.<QueryInternal>d__13`1.MoveNext() +545
   System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) +381
   System.Linq.Enumerable.ToList(IEnumerable`1 source) +58
   Dapper.SqlMapper.Query(IDbConnection cnn, String sql, Object param, IDbTransaction transaction, Boolean buffered, Nullable`1 commandTimeout, Nullable`1 commandType) +218
   Dapper.SqlMapper.Query(IDbConnection cnn, String sql, Object param, IDbTransaction transaction, Boolean buffered, Nullable`1 commandTimeout, Nullable`1 commandType) +88

Everything works fine until sybase create fix v 12.3457 and in 16 version nothing chcanges - the same error! I look into connection object in debug.
In _connStr property cinnection string is right, but in +		ConnectionString I see exception message - 'cn.ConnectionString' threw an exception of type 'System.NullReferenceException'	string {System.NullReferenceException}

public class BaseDapperRepository : IDisposable
{
		protected DbConnection MDbConnection;

		private readonly ConnectionStringSettings _connectionSettings = ConfigurationManager.ConnectionStrings["ApplicationServices"];

	   public BaseDapperRepository()
		{
			var providerFactory = DbProviderFactories.GetFactory(_connectionSettings.ProviderName);
			
			MDbConnection = providerFactory.CreateConnection();
			if (MDbConnection == null)
				throw new Exception("Error while creating connetion to DB");

			MDbConnection.ConnectionString = _connectionSettings.ConnectionString;
			var res = GetIds();

		}

	   public dynamic GetIds()
	   {
		   dynamic result;
		   using (MDbConnection)
		   {
			   MDbConnection.Open();

			   const string sql = @"Vc_sp_language";

			   result = MDbConnection.Query(sql, commandType: CommandType.StoredProcedure);

			   MDbConnection.Close();
		   }

		   return result;
	   }
	   
	   public void Dispose()
	   {
			if(MDbConnection != null)
				MDbConnection.Dispose();
	    }
}

public class HomeController : Controller
{
	private BaseDapperRepository _db;

	protected override void Initialize(RequestContext requestContext)
	{
		if (_db == null)
			_db = new BaseDapperRepository();

		base.Initialize(requestContext);
	}
	
	public ActionResult Index()
	{
		var rep1 = _db.GetIds();		

		return View();
	}
	
	protected override void Dispose(bool disposing)
	{
		if (disposing)
		{
			if (_db != null)
			{
				_db.Dispose();
				_db = null;
			}
		}
		base.Dispose(disposing);
	}
}

public BaseDapperRepository()
{
	var providerFactory = DbProviderFactories.GetFactory(_connectionSettings.ProviderName);
	
	MDbConnection = providerFactory.CreateConnection();
	if (MDbConnection == null)
		throw new Exception("Error while creating connetion to DB");

	MDbConnection.ConnectionString = _connectionSettings.ConnectionString;
	var res = GetIds();
}

// iAnywhere.Data.SQLAnywhere.SAConnection
private bool CalledByEntityFramework()
{
    string[] array = new string[]
    {
        "System.Data.Entity"
    };
    StackTrace stackTrace = new StackTrace();
    for (int i = 0; i < stackTrace.FrameCount; i++)
    {
        Type declaringType = stackTrace.GetFrame(i).GetMethod().DeclaringType;
        string[] array2 = array;
        for (int j = 0; j < array2.Length; j++)
        {
            string value = array2[j];
            //здесь бросается Exception
            if (declaringType.FullName.StartsWith(value, StringComparison.InvariantCultureIgnoreCase)) 
            {
                return true;
            }
        }
    }
    return false;
}