diff --git a/src/EPPlus/Core/Worksheet/WorksheetCopyHelper.cs b/src/EPPlus/Core/Worksheet/WorksheetCopyHelper.cs
index 5f0da53a6..45f5d1e93 100644
--- a/src/EPPlus/Core/Worksheet/WorksheetCopyHelper.cs
+++ b/src/EPPlus/Core/Worksheet/WorksheetCopyHelper.cs
@@ -1427,15 +1427,10 @@ private static void CopyThreadedComments(ExcelWorksheet copy, ExcelWorksheet add
         private static void CopyHeaderFooterPictures(ExcelWorksheet Copy, ExcelWorksheet added)
         {
             if (Copy.TopNode != null && Copy.GetNode("d:headerFooter") == null) return;
-            //Copy the texts
-            if (Copy.HeaderFooter._oddHeader != null) CopyText(Copy.HeaderFooter._oddHeader, added.HeaderFooter.OddHeader);
-            if (Copy.HeaderFooter._oddFooter != null) CopyText(Copy.HeaderFooter._oddFooter, added.HeaderFooter.OddFooter);
-            if (Copy.HeaderFooter._evenHeader != null) CopyText(Copy.HeaderFooter._evenHeader, added.HeaderFooter.EvenHeader);
-            if (Copy.HeaderFooter._evenFooter != null) CopyText(Copy.HeaderFooter._evenFooter, added.HeaderFooter.EvenFooter);
-            if (Copy.HeaderFooter._firstHeader != null) CopyText(Copy.HeaderFooter._firstHeader, added.HeaderFooter.FirstHeader);
-            if (Copy.HeaderFooter._firstFooter != null) CopyText(Copy.HeaderFooter._firstFooter, added.HeaderFooter.FirstFooter);
 
-            //Copy any images;
+            //Copy any images first, so the pictures exist on the target before the
+            //header/footer text is parsed. The text may contain the image code (&G),
+            //and parsing it reads added.HeaderFooter.Pictures.
             if (Copy.HeaderFooter.Pictures.Count > 0)
             {
                 Uri source = Copy.HeaderFooter.Pictures.Uri;
@@ -1456,11 +1451,26 @@ private static void CopyHeaderFooterPictures(ExcelWorksheet Copy, ExcelWorksheet
                     }
                     foreach (XmlAttribute att in pic.TopNode.Attributes)
                     {
+                        // Skip attributes that Pictures.Add/AddImage already set on the new
+                        // shape node, otherwise we get duplicates (e.g. a second "type"
+                        // attribute, which produces invalid VML that cannot be reopened).
+                        if (att.LocalName == "id" || att.LocalName == "type" || att.LocalName == "style")
+                        {
+                            continue;
+                        }
                         (item.TopNode as XmlElement).SetAttribute(att.Name, att.Value);
                     }
                     item.TopNode.InnerXml = pic.TopNode.InnerXml;
                 }
             }
+
+            //Copy the texts
+            if (Copy.HeaderFooter._oddHeader != null) CopyText(Copy.HeaderFooter._oddHeader, added.HeaderFooter.OddHeader);
+            if (Copy.HeaderFooter._oddFooter != null) CopyText(Copy.HeaderFooter._oddFooter, added.HeaderFooter.OddFooter);
+            if (Copy.HeaderFooter._evenHeader != null) CopyText(Copy.HeaderFooter._evenHeader, added.HeaderFooter.EvenHeader);
+            if (Copy.HeaderFooter._evenFooter != null) CopyText(Copy.HeaderFooter._evenFooter, added.HeaderFooter.EvenFooter);
+            if (Copy.HeaderFooter._firstHeader != null) CopyText(Copy.HeaderFooter._firstHeader, added.HeaderFooter.FirstHeader);
+            if (Copy.HeaderFooter._firstFooter != null) CopyText(Copy.HeaderFooter._firstFooter, added.HeaderFooter.FirstFooter);
         }
         private static void CopyText(ExcelHeaderFooterText from, ExcelHeaderFooterText to)
         {
diff --git a/src/EPPlusTest/Core/Worksheet/HeaderrFooterTests.cs b/src/EPPlusTest/Core/Worksheet/HeaderrFooterTests.cs
new file mode 100644
index 000000000..57273bdcc
--- /dev/null
+++ b/src/EPPlusTest/Core/Worksheet/HeaderrFooterTests.cs
@@ -0,0 +1,85 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using OfficeOpenXml;
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using System.Linq;
+using System.Text;
+
+namespace EPPlusTest.Core.Worksheet
+{
+    [TestClass]
+    public class HeaderrFooterTests
+    {
+        [TestMethod]
+        public void Issue_CopyWorksheet_HeaderFooter_Throws()
+        {
+            // Direct C# translation of the reporter's "Reproduction — throws" script.
+            // Source is any workbook that has a header/footer picture.
+            byte[] sourceBytes = CreateWorkbookWithHeaderFooterPicture();
+
+            using (var sourceStream = new MemoryStream(sourceBytes))
+            using (var source = new ExcelPackage(sourceStream))
+            {
+                var sourceSheet = source.Workbook.Worksheets[0];
+
+                // The trigger: read a HeaderFooter property on the source first.
+                var trigger = sourceSheet.HeaderFooter.OddFooter.CenteredText;
+
+                using (var target = new ExcelPackage())
+                {
+                    // Before the fix: throws NullReferenceException from
+                    // WorksheetCopyHelper.CopyHeaderFooterPictures.
+                    target.Workbook.Worksheets.Add("Copied", sourceSheet);
+                }
+            }
+        }
+
+        [TestMethod]
+        public void Issue_CopyWorksheet_HeaderFooter_SilentDataLoss()
+        {
+            byte[] sourceBytes = CreateWorkbookWithHeaderFooterPicture();
+
+            byte[] outputBytes;
+            using (var sourceStream = new MemoryStream(sourceBytes))
+            using (var source = new ExcelPackage(sourceStream))
+            {
+                var sourceSheet = source.Workbook.Worksheets[0];
+
+                // No HeaderFooter read here.
+
+                using (var target = new ExcelPackage())
+                {
+                    var copiedSheet = target.Workbook.Worksheets.Add("Copied", sourceSheet);
+
+                    Assert.AreEqual(1, copiedSheet.HeaderFooter.Pictures.Count,
+                        "Header/footer picture missing right after copy.");
+
+                    outputBytes = target.GetAsByteArray();
+                }
+            }
+
+            // After save + reopen.
+            using (var reopenStream = new MemoryStream(outputBytes))
+            using (var reopen = new ExcelPackage(reopenStream))
+            {
+                var reopenedSheet = reopen.Workbook.Worksheets["Copied"];
+                Assert.AreEqual(1, reopenedSheet.HeaderFooter.Pictures.Count,
+                    "Header/footer picture was lost after save and reopen.");
+            }
+        }
+
+        private static byte[] CreateWorkbookWithHeaderFooterPicture()
+        {
+            // Stands in for the reporter's "/path/to/any-workbook-with-a-footer.xlsx".
+            using (var source = new ExcelPackage())
+            {
+                var ws = source.Workbook.Worksheets.Add("Sheet1");
+                ws.HeaderFooter.OddFooter.CenteredText = "MyFooter";
+                ws.HeaderFooter.OddFooter.InsertPicture(Properties.Resources.Test1, PictureAlignment.Centered);
+                return source.GetAsByteArray();
+            }
+        }
+    }
+}