diff --git a/client/src/app/site/services/auth-check.service.ts b/client/src/app/site/services/auth-check.service.ts
index 36c42aab37..8514bd9ff6 100644
--- a/client/src/app/site/services/auth-check.service.ts
+++ b/client/src/app/site/services/auth-check.service.ts
@@ -97,7 +97,7 @@ export class AuthCheckService {
         if (typeof info === `string`) {
             meetingIdString = this.osRouter.getMeetingId(info);
         }
-        if (Number.isNaN(Number(meetingIdString))) {
+        if (Number.isNaN(Number(meetingIdString)) || +meetingIdString <= 0) {
             return false;
         }
         await this.fetchMeetingIfNotExists(+meetingIdString);
diff --git a/client/src/app/site/services/autoupdate/autoupdate-communication.service.ts b/client/src/app/site/services/autoupdate/autoupdate-communication.service.ts
index 8d00f2e86f..c0ae037ec0 100644
--- a/client/src/app/site/services/autoupdate/autoupdate-communication.service.ts
+++ b/client/src/app/site/services/autoupdate/autoupdate-communication.service.ts
@@ -36,7 +36,7 @@ import { SUBSCRIPTION_SUFFIX } from '../model-request.service';
 })
 export class AutoupdateCommunicationService {
     private autoupdateDataObservable: Observable<AutoupdateReceiveDataContent>;
-    private openResolvers = new Map<string, (value: number | PromiseLike<number>) => void>();
+    private openResolvers = new Map<string, ((value: number | PromiseLike<number>) => void)[]>();
     private endpointName: string;
     private autoupdateEndpointStatus: 'healthy' | 'unhealthy' = `healthy`;
     private unhealtyTimeout: any;
@@ -130,7 +130,11 @@ export class AutoupdateCommunicationService {
     public open(streamId: Id | null, description: string, request: ModelRequest, params = {}): Promise<Id> {
         return new Promise((resolve, reject) => {
             const requestHash = djb2hash(JSON.stringify(request));
-            this.openResolvers.set(requestHash, resolve);
+            if (this.openResolvers.has(requestHash)) {
+                this.openResolvers.get(requestHash).push(resolve);
+            } else {
+                this.openResolvers.set(requestHash, [resolve]);
+            }
             this.sharedWorker
                 .sendMessage(`autoupdate`, {
                     action: `open`,
@@ -298,7 +302,7 @@ export class AutoupdateCommunicationService {
             return;
         }
 
-        this.openResolvers.get(data.content.requestHash)(data.content?.streamId);
+        this.openResolvers.get(data.content.requestHash).forEach(r => r(data.content?.streamId));
         this.openResolvers.delete(data.content.requestHash);
     }
 
diff --git a/client/src/app/site/services/autoupdate/autoupdate.service.ts b/client/src/app/site/services/autoupdate/autoupdate.service.ts
index d8644f9c7f..58556c129a 100644
--- a/client/src/app/site/services/autoupdate/autoupdate.service.ts
+++ b/client/src/app/site/services/autoupdate/autoupdate.service.ts
@@ -71,7 +71,7 @@ export class AutoupdateService {
     private _activeRequestObjects: AutoupdateSubscriptionMap = {};
     private _mutex = new Mutex();
     private _currentQueryParams: QueryParams | null = null;
-    private _resolveDataReceived: ((value: ModelData) => void)[] = [];
+    private _resolveDataReceived: { [key: number]: ((value: ModelData) => void)[] } = [];
 
     public constructor(
         private httpEndpointService: HttpStreamEndpointService,
@@ -224,8 +224,13 @@ export class AutoupdateService {
         );
 
         let rejectReceivedData: any;
+        let resolveIdx: number;
         const receivedData = new Promise<ModelData>((resolve, reject) => {
-            this._resolveDataReceived[id] = resolve;
+            if (this._resolveDataReceived[id]) {
+                resolveIdx = this._resolveDataReceived[id].push(resolve) - 1;
+            } else {
+                this._resolveDataReceived[id] = [resolve];
+            }
             rejectReceivedData = reject;
         });
         receivedData.catch((e: Error) => {
@@ -238,9 +243,9 @@ export class AutoupdateService {
             close: (): void => {
                 this.communication.close(id);
                 delete this._activeRequestObjects[id];
-                if (this._resolveDataReceived[id]) {
+                if (this._resolveDataReceived[id] && this._resolveDataReceived[id][resolveIdx]) {
                     rejectReceivedData(new Error(`Connection canceled`));
-                    delete this._resolveDataReceived[id];
+                    delete this._resolveDataReceived[id][resolveIdx];
                 }
 
                 console.debug(`[autoupdate] stream closed:`, description);
@@ -323,7 +328,12 @@ export class AutoupdateService {
                     this.communication.cleanupCollections(requestId, deletedModels);
 
                     if (this._resolveDataReceived[requestId]) {
-                        this._resolveDataReceived[requestId](modelData);
+                        for (let i = 0; i < this._resolveDataReceived[requestId].length; i++) {
+                            if (this._resolveDataReceived[requestId][i]) {
+                                this._resolveDataReceived[requestId][i](modelData);
+                                delete this._resolveDataReceived[requestId][i];
+                            }
+                        }
                         delete this._resolveDataReceived[requestId];
                     }
                 }