Cart widget not showing in sidebar after update

Theme URL: https://pruebas.celofans.com

After updating WooCommerce to the 3.0.1 version, the cart widget is not being shown in the sidebar, while other WooCommerce/Wordpress widgets do.

You can see the widget title “Carrito”:

However, it works with other themes like Twenty Fifteen, so I guess the problem is in my theme.

I am developing this site from scratch with HTML5 Blank.

I have deactivated all plugins but WooCommerce and removed all custom templates from /mytheme/woocommerce, but still can’t see the cart widget.

System Status Report:

### WordPress Environment ###

Home URL: https://pruebas.celofans.com
Site URL: https://pruebas.celofans.com
WC Version: 3.0.1
Log Directory Writable: ?
WP Version: 4.7.3
WP Multisite: –
WP Memory Limit: 256 MB
WP Debug Mode: –
WP Cron: ?
Language: es_ES

### Server Environment ###

Server Info: Apache
PHP Version: 5.6.23
PHP Post Max Size: 55 MB
PHP Time Limit: 300
PHP Max Input Vars: 6000
cURL Version: 7.38.0
OpenSSL/1.0.1e

SUHOSIN Installed: –
MySQL Version: 5.6.35
Max Upload Size: 55 MB
Default Timezone is UTC: ?
fsockopen/cURL: ?
SoapClient: ?
DOMDocument: ?
GZip: ?
Multibyte String: ?
Remote Post: ?
Remote Get: ?

### Database ###

WC Database Version: 3.0.1
WC Database Prefix: wp_
woocommerce_sessions: ?
woocommerce_api_keys: ?
woocommerce_attribute_taxonomies: ?
woocommerce_downloadable_product_permissions: ?
woocommerce_order_items: ?
woocommerce_order_itemmeta: ?
woocommerce_tax_rates: ?
woocommerce_tax_rate_locations: ?
woocommerce_shipping_zones: ?
woocommerce_shipping_zone_locations: ?
woocommerce_shipping_zone_methods: ?
woocommerce_payment_tokens: ?
woocommerce_payment_tokenmeta: ?
MaxMind GeoIP Database: ?

### Security ###

Secure connection (HTTPS): ?Tu tienda no está usando HTTPS. Aprende más sobre HTTPS y los certificados SSL.
Hide errors from visitors: ?

### Active Plugins (9) ###

Contact Form 7: por Takayuki Miyoshi – 4.7
Duplicator: por Snap Creek – 1.2.4
Flamingo: por Takayuki Miyoshi – 1.5
Regenerate Thumbnails: por Alex Mills (Viper007Bond) – 2.2.6
Simple CSS: por Tom Usborne – 0.4
WooCommerce Product Image Flipper: por jameskoster – 0.3.0
WooCommerce: por Automattic – 3.0.1
Importador de WordPress: por wordpresspuntoorg – 0.6.3
YITH Infinite Scrolling: por YITHEMES – 1.0.7

### Settings ###

API Enabled: ?
Force SSL: –
Currency: EUR (€)
Currency Position: right
Thousand Separator: .
Decimal Separator: ,
Number of Decimals: 2
Taxonomies: Product Types: external (external)
grouped (grouped)
simple (simple)
variable (variable)

### WC Pages ###

Base de la tienda: #4 - /
Carrito: #5 - /carrito/
Finalizar compra: #6 - /finalizar-compra/
Mi cuenta: #7 - /mi-cuenta/

### Theme ###

Name: Celofans
Version: 1.0
Author URL: //facebook.com/ivan.navarro.agullo
Child Theme: ? – Si estás modificando WooCommerce en un tema padre que no has creado personalmente
te recomendamos utilizar un tema hijo. Ver: : Cómo crear un tema hijo

WooCommerce Support: ?

### Templates ###

Overrides: celofans/woocommerce/checkout/form-checkout.php
celofans/woocommerce/content-product.php
celofans/woocommerce/single-product/related.php
celofans/woocommerce/single-product/up-sells.php
celofans/woocommerce/single-product.php

Thank you.