From fa9c40341e2193eed2bb34366152a984beb3ac10 Mon Sep 17 00:00:00 2001
From: Tim Daniel Metzler <tim.metzler@h-brs.de>
Date: Fri, 15 Sep 2023 15:37:38 +0200
Subject: [PATCH] When a cell is not present in the notebook, do not try to
 render an AnnotationUI

---
 .../apps/formgrader/static/js/formgrade_models.js           | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/e2xgrader/server_extensions/apps/formgrader/static/js/formgrade_models.js b/e2xgrader/server_extensions/apps/formgrader/static/js/formgrade_models.js
index eb394246..4c78958a 100644
--- a/e2xgrader/server_extensions/apps/formgrader/static/js/formgrade_models.js
+++ b/e2xgrader/server_extensions/apps/formgrader/static/js/formgrade_models.js
@@ -175,6 +175,12 @@ let Comments = Backbone.Collection.extend({
 
 let AnnotationUI = Backbone.View.extend({
   initialize: function () {
+    if (this.$el.length == 0) {
+      console.log(
+        "Failed to create AnnotationUI. Cell is not present in the notebook"
+      );
+      return;
+    }
     this.$switch = this.$el.find('input[name="annotate"]');
     this.$switch.prop("checked", "checked");