Updating Modern page fails after 2nd time

[arunakshi]

Repro Steps:

1. Created a ClientSidePage with ClientSideText control and 2 standard webparts using OfficeDev.Pnp.Core methods.
2. Update ClientSidePage method.

Actual Result:
I have the scenario like this:
CheckIfPageExists which checks of Page exists, this method works for two times and third time, I am getting: "Object reference not set to an instance of the object" from OfficeDevPnP.Core.Pages.ClientSideText.FromHtml(IElement element)
at OfficeDevPnP.Core.Pages.ClientSidePage.LoadFromHtml(String html)
at OfficeDevPnP.Core.Pages.ClientSidePage.Load(ClientContext cc, String pageName)

My code is like below:

  private static bool CheckIfPageExists(string pageFileName, Web web)
  {      
     // this line fails
       var clientSidePage = ClientSidePage.Load(web.Context.GetSiteCollectionContext(), pageFileName);  
        if (clientSidePage != null)
        {
             return true;
        }
      return false;           
  }

my update method is like this:

 private void UpdatePage(Web web, ProvisioningDescriptor descriptor)
 {
   ClientSideText textContent = new ClientSideText
    {   Text = descriptor.PageContent        };
    if (descriptor.Order != null && descriptor.Order.Value != null)
     {
          clientSidePage.Controls[descriptor.Order.Value].Delete();
           clientSidePage.Save(descriptor.Name);
           clientSidePage.AddControl(textContent, descriptor.Order.Value);
     }
      clientSidePage.Save(descriptor.Name);
 }

I call the CheckIfPageExists method from another method, if CheckIfPageExists returns true I will call UpdatePage.

Anyone has the same problem?

[spdevdocs]

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