From 02d7e772c6e14fb9dfc504aa0f48cfdb54e05a1c Mon Sep 17 00:00:00 2001
From: Ross <xkjq@ymail.com>
Date: Wed, 27 Jan 2021 10:41:19 +0000
Subject: [PATCH] .

---
 js/viewer.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/js/viewer.js b/js/viewer.js
index a277f63..19d59a7 100644
--- a/js/viewer.js
+++ b/js/viewer.js
@@ -511,7 +511,7 @@ export function openMainImage(current_question, t, source) {
   function loadAnnotation(imageId, annotation) {
     const toolStateManager = cornerstoneTools.globalImageIdSpecificToolStateManager;
 
-    if (annotation.length < 1) { return }
+    if (annotation == undefined || annotation.length < 1) { return }
 
     let tool_state_no_id = JSON.parse(annotation);