From cdb090bdd661670055ccac451bc7fcf313a2a026 Mon Sep 17 00:00:00 2001
From: Ron Lucke <lucke@elan-ev.de>
Date: Fri, 4 Feb 2022 10:48:39 +0000
Subject: [PATCH] fix #641

---
 .../vue/components/courseware/CoursewareBlockAdderArea.vue      | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/resources/vue/components/courseware/CoursewareBlockAdderArea.vue b/resources/vue/components/courseware/CoursewareBlockAdderArea.vue
index f3d770f7e51..f2fdc863486 100755
--- a/resources/vue/components/courseware/CoursewareBlockAdderArea.vue
+++ b/resources/vue/components/courseware/CoursewareBlockAdderArea.vue
@@ -51,7 +51,7 @@ export default {
                 this.adderActive = false;
                 this.$emit('updateContainerContent', oldValue);
             } else {
-                if (newValue.container.id === this.container.id && newValue.section === this.section) {
+                if (newValue.container && newValue.container.id === this.container.id && newValue.section === this.section) {
                     this.adderActive = true;
                 } else {
                     this.adderActive = false;
-- 
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