diff --git a/client/src/app/gateways/repositories/meeting_user/meeting-user-repository.service.ts b/client/src/app/gateways/repositories/meeting_user/meeting-user-repository.service.ts
index a4b1f290c0..4498ec3608 100644
--- a/client/src/app/gateways/repositories/meeting_user/meeting-user-repository.service.ts
+++ b/client/src/app/gateways/repositories/meeting_user/meeting-user-repository.service.ts
@@ -1,4 +1,5 @@
 import { Injectable } from '@angular/core';
+import { Id } from 'src/app/domain/definitions/key-types';
 import { MeetingUser } from 'src/app/domain/models/meeting-users/meeting-user';
 import { toDecimal } from 'src/app/infrastructure/utils';
 import { ViewMeetingUser } from 'src/app/site/pages/meetings/view-models/view-meeting-user';
@@ -17,6 +18,8 @@ export type MeetingUserPatchFn =
 export class MeetingUserRepositoryService extends BaseMeetingRelatedRepository<ViewMeetingUser, MeetingUser> {
     public override readonly resetOnMeetingChange = false;
 
+    private meetingUserIdMap: Map<Id, Map<Id, Id>> = new Map();
+
     public constructor(repositoryServiceCollector: RepositoryMeetingServiceCollectorService) {
         super(repositoryServiceCollector, MeetingUser);
     }
@@ -66,4 +69,40 @@ export class MeetingUserRepositoryService extends BaseMeetingRelatedRepository<V
     public getTitle = (viewUser: ViewMeetingUser) => viewUser.user?.getTitle() ?? `Unknown`;
 
     public getVerboseName = (plural = false): string => this.translate.instant(plural ? `Participants` : `Participant`);
+
+    public getMeetingUserId(userId: Id, meetingId: Id): Id | null {
+        if (this.meetingUserIdMap.has(userId) && this.meetingUserIdMap.get(userId).has(meetingId)) {
+            return this.meetingUserIdMap.get(userId).get(meetingId);
+        }
+
+        return null;
+    }
+
+    public override deleteModels(ids: Id[]): void {
+        ids.forEach(id => {
+            const user = this.viewModelStore[id];
+            if (user && user.user_id && user.meeting_id) {
+                const meetingUserId = this.meetingUserIdMap.get(user.user_id)?.get(user.meeting_id);
+                if (meetingUserId === user.id) {
+                    this.meetingUserIdMap.get(user.user_id).delete(user.meeting_id);
+                }
+            }
+        });
+        super.deleteModels(ids);
+    }
+
+    protected override clearViewModelStore(): void {
+        super.clearViewModelStore();
+        this.meetingUserIdMap = new Map();
+    }
+
+    protected override onCreateViewModel(meetingUser: ViewMeetingUser): void {
+        if (meetingUser.user_id && meetingUser.meeting_id) {
+            if (!this.meetingUserIdMap.has(meetingUser.user_id)) {
+                this.meetingUserIdMap.set(meetingUser.user_id, new Map());
+            }
+
+            this.meetingUserIdMap.get(meetingUser.user_id).set(meetingUser.meeting_id, meetingUser.id);
+        }
+    }
 }
diff --git a/client/src/app/gateways/repositories/users/user-repository.service.ts b/client/src/app/gateways/repositories/users/user-repository.service.ts
index 6aec725f71..d056099961 100644
--- a/client/src/app/gateways/repositories/users/user-repository.service.ts
+++ b/client/src/app/gateways/repositories/users/user-repository.service.ts
@@ -338,37 +338,17 @@ export class UserRepositoryService extends BaseRepository<ViewUser, User> {
     protected override createViewModel(model: User): ViewUser {
         const viewModel = super.createViewModel(model);
 
-        const meetingUserIdMap = new Map<Id, Id>();
-        const getMeetingUserId = (meetingId: Id) => {
-            if (!meetingUserIdMap.has(meetingId)) {
-                const meetingUsers = this.relationManager.handleRelation(
-                    viewModel.getModel(),
-                    this.relationsByKey[`meeting_users`]
-                );
-
-                if (meetingUsers?.length) {
-                    for (const meetingUser of meetingUsers) {
-                        meetingUserIdMap.set(meetingUser.meeting_id, meetingUser.id);
-                    }
-                } else {
-                    for (const meetingUser of this.meetingUserRepo.getViewModelList()) {
-                        if (meetingUser.user_id === model.id) {
-                            meetingUserIdMap.set(meetingUser.meeting_id, meetingUser.id);
-                            return meetingUser.id;
-                        }
-                    }
-                }
-            }
-
-            return meetingUserIdMap.get(meetingId);
-        };
-
-        viewModel.getName = () => this.getName(viewModel);
-        viewModel.getShortName = () => this.getShortName(viewModel);
-        viewModel.getFullName = (structureLevel?: ViewStructureLevel) => this.getFullName(viewModel, structureLevel);
-        viewModel.getMeetingUser = (meetingId: Id) => this.getMeetingUser(getMeetingUserId, meetingId);
-        viewModel.getLevelAndNumber = () => this.getLevelAndNumber(viewModel);
-        viewModel.getEnsuredActiveMeetingId = () => this.activeMeetingIdService.meetingId;
+        viewModel.getName = (): string => this.getName(viewModel);
+        viewModel.getShortName = (): string => this.getShortName(viewModel);
+        viewModel.getFullName = (structureLevel?: ViewStructureLevel): string =>
+            this.getFullName(viewModel, structureLevel);
+        viewModel.getMeetingUser = (meetingId: Id): ViewMeetingUser =>
+            this.getMeetingUser(
+                (meetingId: Id): Id => this.meetingUserRepo.getMeetingUserId(model.id, meetingId),
+                meetingId
+            );
+        viewModel.getLevelAndNumber = (): string => this.getLevelAndNumber(viewModel);
+        viewModel.getEnsuredActiveMeetingId = (): Id => this.activeMeetingIdService.meetingId;
         return viewModel;
     }