Created Unassigned: Invalid URI: The hostname could not be parsed. [14998]

The steps are like below

1. I input an email into one cell and it change to hyperlink automatically.
2. I create an new instance by using filestream.
3. Get the worksheet by using Linq: .first(p=>p.sheetName=='something')
4. Get an error like below.

Anyone has the same issue? Please guide!

System.UriFormatException: Invalid URI: The hostname could not be parsed.
at System.Uri.CreateHostStringHelper(String str, UInt16 idx, UInt16 end, Flags& flags, String& scopeId)
at System.Uri.CreateHostString()
at System.Uri.GetComponentsHelper(UriComponents uriComponents, UriFormat uriFormat)
at System.Uri.GetComponents(UriComponents components, UriFormat format)
at System.Uri.get_AbsoluteUri()
at OfficeOpenXml.ExcelWorksheet.LoadHyperLinks(XmlTextReader xr)
at OfficeOpenXml.ExcelWorksheet.CreateXml()
at OfficeOpenXml.ExcelWorksheet..ctor(XmlNamespaceManager ns, ExcelPackage excelPackage, String relID, Uri uriWorksheet, String sheetName, Int32 sheetID, Int32 positionID, eWorkSheetHidden hide)
at OfficeOpenXml.ExcelWorksheets..ctor(ExcelPackage pck, XmlNamespaceManager nsm, XmlNode topNode)
at OfficeOpenXml.ExcelWorkbook.get_Worksheets()