diff --git a/modules/ppcp-settings/resources/js/data/styling/hooks.js b/modules/ppcp-settings/resources/js/data/styling/hooks.js
index e50896ea3..ffcde584f 100644
--- a/modules/ppcp-settings/resources/js/data/styling/hooks.js
+++ b/modules/ppcp-settings/resources/js/data/styling/hooks.js
@@ -83,52 +83,86 @@ export const useLocationProps = ( location ) => {
 	const { getLocationProp, setLocationProp } = useHooks();
 	const details = STYLING_LOCATIONS[ location ] ?? {};
 
+	const sanitize = ( value ) => ( undefined === value ? true : !! value );
+
 	return {
 		choices: Object.values( STYLING_LOCATIONS ),
 		details,
-		isActive: getLocationProp( location, 'enabled' ),
-		setActive: ( state ) => setLocationProp( location, 'enabled', state ),
+		isActive: sanitize( getLocationProp( location, 'enabled' ) ),
+		setActive: ( state ) =>
+			setLocationProp( location, 'enabled', sanitize( state ) ),
 	};
 };
 
 export const usePaymentMethodProps = ( location ) => {
 	const { getLocationProp, setLocationProp } = useHooks();
 
+	const sanitize = ( value ) => {
+		if ( Array.isArray( value ) ) {
+			return value;
+		}
+		return value ? [ value ] : [];
+	};
+
 	return {
 		choices: Object.values( STYLING_PAYMENT_METHODS ),
-		paymentMethods: getLocationProp( location, 'methods' ),
+		paymentMethods: sanitize( getLocationProp( location, 'methods' ) ),
 		setPaymentMethods: ( methods ) =>
-			setLocationProp( location, 'methods', methods ),
+			setLocationProp( location, 'methods', sanitize( methods ) ),
 	};
 };
 
 export const useColorProps = ( location ) => {
 	const { getLocationProp, setLocationProp } = useHooks();
 
+	const sanitize = ( value ) => {
+		const isValidColor = Object.values( STYLING_COLORS ).some(
+			( color ) => color.value === value
+		);
+		return isValidColor ? value : STYLING_COLORS.gold.value;
+	};
+
 	return {
 		choices: Object.values( STYLING_COLORS ),
-		color: getLocationProp( location, 'color' ),
-		setColor: ( color ) => setLocationProp( location, 'color', color ),
+		color: sanitize( getLocationProp( location, 'color' ) ),
+		setColor: ( color ) =>
+			setLocationProp( location, 'color', sanitize( color ) ),
 	};
 };
 
 export const useShapeProps = ( location ) => {
 	const { getLocationProp, setLocationProp } = useHooks();
 
+	const sanitize = ( value ) => {
+		const isValidColor = Object.values( STYLING_SHAPES ).some(
+			( color ) => color.value === value
+		);
+		return isValidColor ? value : STYLING_SHAPES.rect.value;
+	};
+
 	return {
 		choices: Object.values( STYLING_SHAPES ),
-		shape: getLocationProp( location, 'shape' ),
-		setShape: ( shape ) => setLocationProp( location, 'shape', shape ),
+		shape: sanitize( getLocationProp( location, 'shape' ) ),
+		setShape: ( shape ) =>
+			setLocationProp( location, 'shape', sanitize( shape ) ),
 	};
 };
 
 export const useLabelProps = ( location ) => {
 	const { getLocationProp, setLocationProp } = useHooks();
 
+	const sanitize = ( value ) => {
+		const isValidColor = Object.values( STYLING_LABELS ).some(
+			( color ) => color.value === value
+		);
+		return isValidColor ? value : STYLING_LABELS.paypal.value;
+	};
+
 	return {
 		choices: Object.values( STYLING_LABELS ),
-		label: getLocationProp( location, 'label' ),
-		setLabel: ( label ) => setLocationProp( location, 'label', label ),
+		label: sanitize( getLocationProp( location, 'label' ) ),
+		setLabel: ( label ) =>
+			setLocationProp( location, 'label', sanitize( label ) ),
 	};
 };
 
@@ -137,11 +171,19 @@ export const useLayoutProps = ( location ) => {
 	const { details } = useLocationProps( location );
 	const isAvailable = false !== details.props.layout;
 
+	const sanitize = ( value ) => {
+		const isValidColor = Object.values( STYLING_LAYOUTS ).some(
+			( color ) => color.value === value
+		);
+		return isValidColor ? value : STYLING_LAYOUTS.vertical.value;
+	};
+
 	return {
 		choices: Object.values( STYLING_LAYOUTS ),
 		isAvailable,
-		layout: getLocationProp( location, 'layout' ),
-		setLayout: ( layout ) => setLocationProp( location, 'layout', layout ),
+		layout: sanitize( getLocationProp( location, 'layout' ) ),
+		setLayout: ( layout ) =>
+			setLocationProp( location, 'layout', sanitize( layout ) ),
 	};
 };
 
@@ -155,10 +197,14 @@ export const useTaglineProps = ( location ) => {
 		STYLING_LAYOUTS.horizontal.value ===
 			getLocationProp( location, 'layout' );
 
+	const sanitize = ( value ) => !! value;
+
 	return {
 		isAvailable,
-		tagline: isAvailable ? getLocationProp( location, 'tagline' ) : false,
+		tagline: isAvailable
+			? sanitize( getLocationProp( location, 'tagline' ) )
+			: false,
 		setTagline: ( tagline ) =>
-			setLocationProp( location, 'tagline', tagline ),
+			setLocationProp( location, 'tagline', sanitize( tagline ) ),
 	};
 };
diff --git a/modules/ppcp-settings/resources/js/data/styling/reducer.js b/modules/ppcp-settings/resources/js/data/styling/reducer.js
index 5ce6062a9..db92d646b 100644
--- a/modules/ppcp-settings/resources/js/data/styling/reducer.js
+++ b/modules/ppcp-settings/resources/js/data/styling/reducer.js
@@ -70,6 +70,19 @@ const defaultPersistent = Object.freeze( {
 	} ),
 } );
 
+const sanitizeLocation = ( oldDetails, newDetails ) => {
+	// Skip if provided details are not a plain object.
+	if (
+		! newDetails ||
+		'object' !== typeof newDetails ||
+		Array.isArray( newDetails )
+	) {
+		return oldDetails;
+	}
+
+	return { ...oldDetails, ...newDetails };
+};
+
 // Reducer logic.
 
 const [ setTransient, setPersistent ] = createSetters(
@@ -96,8 +109,20 @@ const reducer = createReducer( defaultTransient, defaultPersistent, {
 		return cleanState;
 	},
 
-	[ ACTION_TYPES.HYDRATE ]: ( state, payload ) =>
-		setPersistent( state, payload.data ),
+	[ ACTION_TYPES.HYDRATE ]: ( state, payload ) => {
+		const validData = Object.keys( defaultPersistent ).reduce(
+			( data, location ) => {
+				data[ location ] = sanitizeLocation(
+					state.data[ location ],
+					payload.data[ location ]
+				);
+				return data;
+			},
+			{}
+		);
+
+		return setPersistent( state, validData );
+	},
 } );
 
 export default reducer;