diff --git a/src/Umbraco.Web.UI.Client/src/installer/installer-consent.element.ts b/src/Umbraco.Web.UI.Client/src/installer/installer-consent.element.ts
index 57c1418077..1051ba540c 100644
--- a/src/Umbraco.Web.UI.Client/src/installer/installer-consent.element.ts
+++ b/src/Umbraco.Web.UI.Client/src/installer/installer-consent.element.ts
@@ -48,10 +48,10 @@ export class UmbInstallerConsent extends UmbContextConsumerMixin(LitElement) {
 	private _telemetryLevels: TelemetryModel[] = [];
 
 	@state()
-	private _telemetryFormData!: TelemetryModel['level'];
+	private _telemetryFormData?: TelemetryModel['level'];
 
 	@state()
-	private _installerStore!: UmbInstallerContext;
+	private _installerStore?: UmbInstallerContext;
 
 	private storeDataSubscription?: Subscription;
 	private storeSettingsSubscription?: Subscription;
@@ -85,7 +85,7 @@ export class UmbInstallerConsent extends UmbContextConsumerMixin(LitElement) {
 
 		const value: { [key: string]: string } = {};
 		value[target.name] = this._telemetryLevels[parseInt(target.value) - 1].level;
-		this._installerStore.appendData(value);
+		this._installerStore?.appendData(value);
 	}
 
 	private _onNext() {
@@ -105,7 +105,7 @@ export class UmbInstallerConsent extends UmbContextConsumerMixin(LitElement) {
 	}
 
 	private _renderSlider() {
-		if (!this._telemetryLevels) return;
+		if (!this._telemetryLevels || this._telemetryLevels.length < 1) return;
 
 		return html`
 			<uui-slider
diff --git a/src/Umbraco.Web.UI.Client/src/installer/installer-database.element.ts b/src/Umbraco.Web.UI.Client/src/installer/installer-database.element.ts
index 39d4c9e41a..bbc56a7fe4 100644
--- a/src/Umbraco.Web.UI.Client/src/installer/installer-database.element.ts
+++ b/src/Umbraco.Web.UI.Client/src/installer/installer-database.element.ts
@@ -99,7 +99,7 @@ export class UmbInstallerDatabase extends UmbContextConsumerMixin(LitElement) {
 	private _preConfiguredDatabase?: UmbracoInstallerDatabaseModel;
 
 	@state()
-	private _installerStore!: UmbInstallerContext;
+	private _installerStore?: UmbInstallerContext;
 
 	private storeDataSubscription?: Subscription;
 	private storeSettingsSubscription?: Subscription;
@@ -142,9 +142,9 @@ export class UmbInstallerDatabase extends UmbContextConsumerMixin(LitElement) {
 		const value: { [key: string]: string | boolean } = {};
 		value[target.name] = target.checked ?? target.value; // handle boolean and text inputs
 
-		const database = { ...this._installerStore.getData().database, ...value };
+		const database = { ...this._installerStore?.getData().database, ...value };
 
-		this._installerStore.appendData({ database });
+		this._installerStore?.appendData({ database });
 	}
 
 	private _handleSubmit = (e: SubmitEvent) => {
@@ -167,7 +167,7 @@ export class UmbInstallerDatabase extends UmbContextConsumerMixin(LitElement) {
 			const useIntegratedAuthentication = formData.has('useIntegratedAuthentication');
 
 			const database = {
-				...this._installerStore.getData().database,
+				...this._installerStore?.getData().database,
 				id,
 				username,
 				password,
@@ -176,10 +176,10 @@ export class UmbInstallerDatabase extends UmbContextConsumerMixin(LitElement) {
 				useIntegratedAuthentication,
 			} as UmbracoPerformInstallDatabaseConfiguration;
 
-			this._installerStore.appendData({ database });
+			this._installerStore?.appendData({ database });
 		}
 
-		this._installerStore.requestInstall().then(this._handleFulfilled.bind(this), this._handleRejected.bind(this));
+		this._installerStore?.requestInstall().then(this._handleFulfilled.bind(this), this._handleRejected.bind(this));
 		this._installButton.state = 'waiting';
 	};
 	private _handleFulfilled() {
@@ -195,7 +195,7 @@ export class UmbInstallerDatabase extends UmbContextConsumerMixin(LitElement) {
 	}
 
 	private get selectedDatabase() {
-		const id = this._installerStore.getData().database?.id;
+		const id = this._installerStore?.getData().database?.id;
 		console.log('selected id', id, this._databases);
 		return this._databases.find((x) => x.id === id) ?? this._databases[0];
 	}
diff --git a/src/Umbraco.Web.UI.Client/src/installer/installer-user.element.ts b/src/Umbraco.Web.UI.Client/src/installer/installer-user.element.ts
index 6686843774..62ded475be 100644
--- a/src/Umbraco.Web.UI.Client/src/installer/installer-user.element.ts
+++ b/src/Umbraco.Web.UI.Client/src/installer/installer-user.element.ts
@@ -57,10 +57,10 @@ export class UmbInstallerUser extends UmbContextConsumerMixin(LitElement) {
 	];
 
 	@state()
-	private _userFormData!: { name: string; password: string; email: string; subscribeToNewsletter: boolean };
+	private _userFormData?: { name: string; password: string; email: string; subscribeToNewsletter: boolean };
 
 	@state()
-	private _installerStore!: UmbInstallerContext;
+	private _installerStore?: UmbInstallerContext;
 
 	private installerStoreSubscription?: Subscription;
 
@@ -101,7 +101,7 @@ export class UmbInstallerUser extends UmbContextConsumerMixin(LitElement) {
 		const email = formData.get('email');
 		const subscribeToNewsletter = formData.has('subscribeToNewsletter');
 
-		this._installerStore.appendData({ user: { name, password, email, subscribeToNewsletter } });
+		this._installerStore?.appendData({ user: { name, password, email, subscribeToNewsletter } });
 		this.dispatchEvent(new CustomEvent('next', { bubbles: true, composed: true }));
 	};
 
@@ -115,7 +115,7 @@ export class UmbInstallerUser extends UmbContextConsumerMixin(LitElement) {
 						<uui-input
 							type="text"
 							id="name"
-							.value=${this._userFormData.name}
+							.value=${this._userFormData?.name}
 							name="name"
 							required
 							required-message="Name is required"></uui-input>
@@ -126,7 +126,7 @@ export class UmbInstallerUser extends UmbContextConsumerMixin(LitElement) {
 						<uui-input
 							type="email"
 							id="email"
-							.value=${this._userFormData.email}
+							.value=${this._userFormData?.email}
 							name="email"
 							required
 							required-message="Email is required"></uui-input>
@@ -137,7 +137,7 @@ export class UmbInstallerUser extends UmbContextConsumerMixin(LitElement) {
 						<uui-input-password
 							id="password"
 							name="password"
-							.value=${this._userFormData.password}
+							.value=${this._userFormData?.password}
 							required
 							required-message="Password is required"></uui-input-password>
 					</uui-form-layout-item>
@@ -146,7 +146,7 @@ export class UmbInstallerUser extends UmbContextConsumerMixin(LitElement) {
 						<uui-checkbox
 							name="subscribeToNewsletter"
 							label="Remember me"
-							.checked=${this._userFormData.subscribeToNewsletter}>
+							.checked=${this._userFormData?.subscribeToNewsletter || false}>
 							Keep me updated on Umbraco Versions, Security Bulletins and Community News
 						</uui-checkbox>
 					</uui-form-layout-item>