diff --git a/client/src/pages/CockpitPage.vue b/client/src/pages/CockpitPage.vue
index 2556d10c..873f4dc0 100644
--- a/client/src/pages/CockpitPage.vue
+++ b/client/src/pages/CockpitPage.vue
@@ -37,7 +37,10 @@ onMounted(async () => {
           <h2 class="mt-12 mb-3">Kurse</h2>
 
           <div class="grid grid-cols-1 md:grid-cols-2 gap-4 auto-rows-fr">
-            <div v-for="courseSession in courseSessionsStore.courseSessions">
+            <div
+              v-for="courseSession in courseSessionsStore.courseSessions"
+              :key="courseSession.id"
+            >
               <div class="bg-white p-6 md:h-full">
                 <h3 class="mb-4">{{ courseSession.title }}</h3>
                 <img class="mb-8 block" :src="'/static/icons/demo/vm-lernpfad.svg'" />
diff --git a/client/src/stores/completion.ts b/client/src/stores/completion.ts
index 3d422aa6..04b81471 100644
--- a/client/src/stores/completion.ts
+++ b/client/src/stores/completion.ts
@@ -1,4 +1,4 @@
-import { itGetCached, itPost } from "@/fetchHelpers";
+import { bustItGetCache, itGetCached, itPost } from "@/fetchHelpers";
 import type { BaseCourseWagtailPage, CourseCompletion } from "@/types";
 import { defineStore } from "pinia";
 
@@ -32,8 +32,9 @@ export const useCompletionStore = defineStore({
         completion_status: page.completion_status,
       });
 
-      if (completionData) {
+      if (completionData && completionData.length > 0) {
         this.completionData = completionData;
+        bustItGetCache(`/api/course/completion/${completionData[0].course}/`);
       }
 
       return this.completionData || [];