diff --git a/frontend/src/components/CalendarViewer.vue b/frontend/src/components/CalendarViewer.vue
index 19fb504..02fee48 100644
--- a/frontend/src/components/CalendarViewer.vue
+++ b/frontend/src/components/CalendarViewer.vue
@@ -214,7 +214,7 @@ watch(mobilePage, () => {
       <p><b>{{ $t("calendarViewer.start") }}:</b> {{ clickedEvent.start ? $d(clickedEvent.start, "long") : ""}}</p>
       <p><b>{{ $t("calendarViewer.end") }}:</b> {{ clickedEvent.end ? $d(clickedEvent.end, "long") : "" }}</p>
       <p><b>{{ $t("calendarViewer.notes") }}:</b></p>
-      <p v-for="note in clickedEvent.notes.split('\n')" class="note-line">{{ note }}</p>
+      <p v-for="note in clickedEvent.notes.split('\n')" class="note-line" :key="note">{{ note }}</p>
     </div>
   </OverlayPanel>
 </template>