Skip Test Error

Whenever I run my test as well as the test from the downloaded code i do get this error once a test is skipped:

Message: Skipping test with RunMode of No
TearDown : System.NullReferenceException : Object reference not set to an instance of an object.

here is my code on TearDown

public class BaseLink
{
    public ExtentReports ExtentReports = ExtentManager.GetReport();
    public Link Link = null;

    [TearDown]
    public void Quit()
   {
      if (ExtentReports != null)
      ExtentReports.Flush();
      if (Link != null)
      Link.GetGenericKeywords().CloseBrowser();
   }
}

Please, what am I doing wrong?