diff --git a/src/app/tabs/dashboard.component.html b/src/app/tabs/dashboard.component.html
index 7017af5c..24634350 100644
--- a/src/app/tabs/dashboard.component.html
+++ b/src/app/tabs/dashboard.component.html
@@ -15,8 +15,8 @@
             Simulate
         </button>
         <div class="form-check mt-2">
-            <input class="form-check-input" type="checkbox" id="sinceLast" [(ngModel)]="sinceLast">
-            <label class="form-check-label" for="sinceLast">Since the last successful sync</label>
+            <input class="form-check-input" type="checkbox" id="simSinceLast" [(ngModel)]="simSinceLast">
+            <label class="form-check-label" for="simSinceLast">Since the last successful sync</label>
         </div>
         <ng-container *ngIf="!simBtn.loading && (simUsers || simGroups)">
             <hr />
diff --git a/src/app/tabs/dashboard.component.ts b/src/app/tabs/dashboard.component.ts
index 9616347c..9b88bc0a 100644
--- a/src/app/tabs/dashboard.component.ts
+++ b/src/app/tabs/dashboard.component.ts
@@ -21,8 +21,8 @@ export class DashboardComponent {
     simDisabledUsers: UserEntry[] = [];
     simDeletedUsers: UserEntry[] = [];
     simPromise: Promise<any>;
+    simSinceLast: boolean = false;
     syncPromise: Promise<any>;
-    sinceLast: boolean = false;
 
     constructor(private i18nService: I18nService, private syncService: SyncService) { }
 
@@ -32,9 +32,15 @@ export class DashboardComponent {
     }
 
     async simulate() {
+        this.simGroups = null;
+        this.simUsers = null;
+        this.simEnabledUsers = [];
+        this.simDisabledUsers = [];
+        this.simDeletedUsers = [];
+
         this.simPromise = new Promise(async (resolve, reject) => {
             try {
-                const result = await this.syncService.sync(!this.sinceLast, false);
+                const result = await this.syncService.sync(!this.simSinceLast, false);
                 this.simUsers = result[1];
                 this.simGroups = result[0];
             } catch (e) {