From 2bb0e00389a5fc2463890331df62928be974169c Mon Sep 17 00:00:00 2001
From: Annie <22462084+LostABike@users.noreply.github.com>
Date: Thu, 23 Mar 2023 12:23:41 -0500
Subject: [PATCH 1/3] check undefined

---
 .../itwinui-react/src/core/Table/hooks/useResizeColumns.tsx    | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/packages/itwinui-react/src/core/Table/hooks/useResizeColumns.tsx b/packages/itwinui-react/src/core/Table/hooks/useResizeColumns.tsx
index a1680581631..d4b21ae8a4a 100644
--- a/packages/itwinui-react/src/core/Table/hooks/useResizeColumns.tsx
+++ b/packages/itwinui-react/src/core/Table/hooks/useResizeColumns.tsx
@@ -496,6 +496,9 @@ function getLeafHeaders(header: HeaderGroup) {
 const getHeaderWidth = <T extends Record<string, unknown>>(
   header: ColumnInstance<T>,
 ) => {
+  if (!header) {
+    return 0;
+  }
   return Number(header.width || header.resizeWidth || 0);
 };
 

From de9f4fe54d3e41faafc8a55efd2bb956776a1957 Mon Sep 17 00:00:00 2001
From: Annie <22462084+LostABike@users.noreply.github.com>
Date: Thu, 23 Mar 2023 12:35:43 -0500
Subject: [PATCH 2/3] added changeset

---
 .changeset/hip-suns-repeat.md | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 .changeset/hip-suns-repeat.md

diff --git a/.changeset/hip-suns-repeat.md b/.changeset/hip-suns-repeat.md
new file mode 100644
index 00000000000..743321f4550
--- /dev/null
+++ b/.changeset/hip-suns-repeat.md
@@ -0,0 +1,5 @@
+---
+'@itwin/itwinui-react': patch
+---
+
+Fixes an issue where table crashes when resizing the Column Manager column in expand mode

From 617dbe6574320f5fb21525e80986251a4cc5e192 Mon Sep 17 00:00:00 2001
From: Annie <22462084+LostABike@users.noreply.github.com>
Date: Thu, 23 Mar 2023 12:36:31 -0500
Subject: [PATCH 3/3] ..

---
 .changeset/hip-suns-repeat.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.changeset/hip-suns-repeat.md b/.changeset/hip-suns-repeat.md
index 743321f4550..3a3419a88e0 100644
--- a/.changeset/hip-suns-repeat.md
+++ b/.changeset/hip-suns-repeat.md
@@ -2,4 +2,4 @@
 '@itwin/itwinui-react': patch
 ---
 
-Fixes an issue where table crashes when resizing the Column Manager column in expand mode
+Fixes an issue where table crashes when resizing the Column Manager column in expand mode.