diff --git a/client/src/pages/competence/CompetenceAssignmentRow.vue b/client/src/pages/competence/CompetenceAssignmentRow.vue
index e887f53e..c2e09118 100644
--- a/client/src/pages/competence/CompetenceAssignmentRow.vue
+++ b/client/src/pages/competence/CompetenceAssignmentRow.vue
@@ -48,7 +48,7 @@ const openInCircle = (assignment: CompetenceCertificateAssignment) => {
         v-if="showCourseSession"
         :data-cy="`assignment-${assignment.slug}-course-session`"
       >
-        {{ assignment?.completions[0]?.course_session.title }}
+        {{ assignment?.completions?.[0]?.course_session.title }}
       </p>
       <p class="text-gray-800">
         <button
@@ -69,7 +69,7 @@ const openInCircle = (assignment: CompetenceCertificateAssignment) => {
     </div>
     <div class="grow lg:px-8">
       <div
-        v-if="assignment.completions[0]?.completion_status === 'EVALUATION_SUBMITTED'"
+        v-if="assignment.completions?.[0]?.completion_status === 'EVALUATION_SUBMITTED'"
         class="flex items-center"
       >
         <div
@@ -82,7 +82,7 @@ const openInCircle = (assignment: CompetenceCertificateAssignment) => {
       <div
         v-else-if="
           ['EVALUATION_IN_PROGRESS', 'SUBMITTED'].includes(
-            assignment.completions[0]?.completion_status || ''
+            assignment.completions?.[0]?.completion_status || ''
           )
         "
         class="flex items-center"
@@ -97,7 +97,7 @@ const openInCircle = (assignment: CompetenceCertificateAssignment) => {
     </div>
     <div>
       <div
-        v-if="assignment.completions[0]?.completion_status === 'EVALUATION_SUBMITTED'"
+        v-if="assignment.completions?.[0]?.completion_status === 'EVALUATION_SUBMITTED'"
         class="flex flex-col lg:items-center"
       >
         <div class="flex flex-col lg:items-center">
diff --git a/client/src/pages/competence/CompetenceCertificateComponent.vue b/client/src/pages/competence/CompetenceCertificateComponent.vue
index 41b82013..ee1728e0 100644
--- a/client/src/pages/competence/CompetenceCertificateComponent.vue
+++ b/client/src/pages/competence/CompetenceCertificateComponent.vue
@@ -33,7 +33,7 @@ const userGradeRounded2Places = computed(() => {
 
 const numAssignmentsEvaluated = computed(() => {
   return props.competenceCertificate.assignments.filter((a) => {
-    return a.completions[0]?.completion_status === "EVALUATION_SUBMITTED";
+    return a?.completions?.[0]?.completion_status === "EVALUATION_SUBMITTED";
   }).length;
 });
 
@@ -57,7 +57,7 @@ const showCourseSession = computed(() => {
   const currentCourseSession = useCurrentCourseSession();
   return props.competenceCertificate.assignments.some((assignment) => {
     return (
-      assignment.completions[0]?.course_session.title !==
+      assignment.completions?.[0]?.course_session.title !==
       currentCourseSession.value.title
     );
   });
diff --git a/client/src/pages/competence/CompetenceCertificateListPage.vue b/client/src/pages/competence/CompetenceCertificateListPage.vue
index d42bcd28..9a51eb56 100644
--- a/client/src/pages/competence/CompetenceCertificateListPage.vue
+++ b/client/src/pages/competence/CompetenceCertificateListPage.vue
@@ -38,7 +38,7 @@ const userPointsEvaluatedAssignments = computed(() => {
 
 const numAssignmentsEvaluated = computed(() => {
   return (assignments.value ?? []).filter((a) => {
-    return a.completions[0]?.completion_status === "EVALUATION_SUBMITTED";
+    return a.completions?.[0]?.completion_status === "EVALUATION_SUBMITTED";
   }).length;
 });
 
diff --git a/client/src/pages/competence/utils.ts b/client/src/pages/competence/utils.ts
index 4488ce60..2a42d762 100644
--- a/client/src/pages/competence/utils.ts
+++ b/client/src/pages/competence/utils.ts
@@ -17,8 +17,8 @@ export function assignmentsMaxEvaluationPoints(
 export function assignmentsUserPoints(assignments: CompetenceCertificateAssignment[]) {
   return +_.sum(
     assignments
-      .filter((a) => a.completions[0]?.completion_status === "EVALUATION_SUBMITTED")
-      .map((a) => a.completions[0]?.evaluation_points_final ?? 0)
+      .filter((a) => a.completions?.[0]?.completion_status === "EVALUATION_SUBMITTED")
+      .map((a) => a.completions?.[0]?.evaluation_points_final ?? 0)
   ).toFixed(1);
 }
 
@@ -27,12 +27,12 @@ export function calcCompetenceCertificateGrade(
   roundedToHalfGrade = true
 ) {
   const evaluatedAssignments = assignments.filter(
-    (a) => a.completions[0]?.completion_status === "EVALUATION_SUBMITTED"
+    (a) => a.completions?.[0]?.completion_status === "EVALUATION_SUBMITTED"
   );
 
   const adjustedResults = evaluatedAssignments.map((a) => {
     return (
-      ((a.completions[0]?.evaluation_points_final ?? 0) / a.max_points) *
+      ((a.completions?.[0]?.evaluation_points_final ?? 0) / a.max_points) *
       a.competence_certificate_weight
     );
   });
@@ -77,7 +77,7 @@ export function competenceCertificateProgressStatusCount(
   assignments: CompetenceCertificateAssignment[]
 ) {
   const numAssignmentsEvaluated = assignments.filter(
-    (a) => a.completions[0]?.completion_status === "EVALUATION_SUBMITTED"
+    (a) => a.completions?.[0]?.completion_status === "EVALUATION_SUBMITTED"
   ).length;
   return {
     SUCCESS: numAssignmentsEvaluated,
@@ -120,8 +120,8 @@ export function mergeCompetenceCertificates(
         if (!existingAssignment) {
           mergedCertificate.assignments.push(assignment);
         } else if (
-          assignment.completions[0] != null &&
-          (existingAssignment.completions[0] == null ||
+          assignment.completions?.[0] != null &&
+          (existingAssignment.completions?.[0] == null ||
             dayjs(existingAssignment.completions[0].evaluation_submitted_at).isBefore(
               assignment.completions[0].evaluation_submitted_at
             ))
diff --git a/client/src/pages/dashboard/DashboardPersonsPage.vue b/client/src/pages/dashboard/DashboardPersonsPage.vue
index bd7269ff..4d182a08 100644
--- a/client/src/pages/dashboard/DashboardPersonsPage.vue
+++ b/client/src/pages/dashboard/DashboardPersonsPage.vue
@@ -408,7 +408,7 @@ watch(selectedRegion, () => {
                       v-if="
                         (['SUPERVISOR', 'EXPERT'].includes(cs.my_role) &&
                           cs.user_role === 'MEMBER') ||
-                        (cs.my_role === 'LEARNING_MENTOR' &&
+                        (['LEARNING_MENTOR', 'BERUFSBILDNER'].includes(cs.my_role) &&
                           cs.user_role === 'PARTICIPANT')
                       "
                     >
diff --git a/client/src/pages/dashboard/agentAssignment/AgentCompetenceGradeDetailPage.vue b/client/src/pages/dashboard/agentAssignment/AgentCompetenceGradeDetailPage.vue
index a13f0775..0fdf65d7 100644
--- a/client/src/pages/dashboard/agentAssignment/AgentCompetenceGradeDetailPage.vue
+++ b/client/src/pages/dashboard/agentAssignment/AgentCompetenceGradeDetailPage.vue
@@ -42,7 +42,7 @@ function userGrade(userId: string) {
     );
     for (const assignment of assignmentsWithUserCompletions) {
       assignment.completions = assignment.completions?.filter(
-        (c) => c?.assignment_user.id === userId
+        (c) => c?.assignment_user?.id === userId
       );
     }