From 5f01090e7c1fe4fad47512986726377494c27c69 Mon Sep 17 00:00:00 2001
From: Artem Koloskov <artem@ironsoftware.com>
Date: Thu, 24 Aug 2023 18:53:04 +0700
Subject: [PATCH] upstr: Add null checks to XSSFSheet.RemoveHyperlink method

---
 ooxml/XSSF/UserModel/XSSFSheet.cs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/ooxml/XSSF/UserModel/XSSFSheet.cs b/ooxml/XSSF/UserModel/XSSFSheet.cs
index 522b1337c..1e3322583 100644
--- a/ooxml/XSSF/UserModel/XSSFSheet.cs
+++ b/ooxml/XSSF/UserModel/XSSFSheet.cs
@@ -3014,7 +3014,14 @@ public void RemoveHyperlink(int row, int column)
                 XSSFHyperlink hyperlink = hyperlinks[index];
                 if (hyperlink.CellRef.Equals(ref1))
                 {
-                    worksheet.hyperlinks.hyperlink.Remove(hyperlink.GetCTHyperlink());
+                    if (worksheet != null
+                        && worksheet.hyperlinks != null
+                        && worksheet.hyperlinks.hyperlink != null
+                        && worksheet.hyperlinks.hyperlink.Contains(hyperlink.GetCTHyperlink()))
+                    {
+                        worksheet.hyperlinks.hyperlink.Remove(hyperlink.GetCTHyperlink());
+                    }
+
                     hyperlinks.RemoveAt(index);
                     return;
                 }