Accessing HeaderFooter.FirstHeader throws Null reference exception

[chifgeri]

EPPlus usage

Commercial use (I have a commercial license)

Environment

Windows

Epplus version

8.1.0

Spreadsheet application

Excel

Description

After upgrading the version to 8.1.0. The following section throws Null reference exception:

var drawing = worksheet.HeaderFooter.FirstHeader.InsertPicture(fs, ePictureType.Png, PictureAlignment.Left);
drawing.Height = 40;

worksheet.HeaderFooter.FirstHeader.CenteredText = pageTitle;
worksheet.HeaderFooter.FirstFooter.LeftAlignedText = $"{ExcelHeaderFooter.CurrentDate} {ExcelHeaderFooter.CurrentTime}";
worksheet.HeaderFooter.FirstFooter.RightAlignedText = $"Printing: {user.DisplayName} - {ExcelHeaderFooter.PageNumber}/{ExcelHeaderFooter.NumberOfPages}";

Tried access only the FirstHeader, but this also throws an exception:

var fh = worksheet.HeaderFooter.FirstHeader;

It works perfectly in 8.0.8 so currently we rolled back the version.

I think its related to this bug:
#2078

Please, can you check this?

[AdrianEPPlus]

It seems your issue is related to the previous one. When I run your code it works as it should. As you can see on the previous issue a PR is already up and waiting for approval.