From 71d736067d9f093079ff1b0f6d5fbafe77b1be3e Mon Sep 17 00:00:00 2001
From: Gabriel Lebaudy <gabriel.lebaudy@gmail.com>
Date: Wed, 30 Nov 2022 17:35:27 +0100
Subject: [PATCH] fix: handle undefined instance object (#3042)

Some DisplaySets don't have a `instance` property, thus throwing an error at this location.

This change fixes this issue.
---
 .../src/services/SegmentationService/SegmentationService.ts   | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/extensions/cornerstone/src/services/SegmentationService/SegmentationService.ts b/extensions/cornerstone/src/services/SegmentationService/SegmentationService.ts
index 559d0f069..54b88c2ae 100644
--- a/extensions/cornerstone/src/services/SegmentationService/SegmentationService.ts
+++ b/extensions/cornerstone/src/services/SegmentationService/SegmentationService.ts
@@ -1332,9 +1332,7 @@ class SegmentationService {
       segDisplaySetInstanceUID
     );
 
-    const {
-      FrameOfReferenceUID: segFrameOfReferenceUID,
-    } = segDisplaySet.instance;
+    const segFrameOfReferenceUID = segDisplaySet.instance?.FrameOfReferenceUID;
 
     viewportDisplaySetInstanceUIDs.forEach(displaySetInstanceUID => {
       // check if the displaySet is sharing the same frameOfReferenceUID