Can’t update the order to processing

My website is not working whenever I try to update the orders detail to hold-on to processing. I notice the same issue when I try to deactivate plugins and clear cache.

I got this error in my debug log:
[18-Jan-2019 03:50:40 UTC] PHP Notice: Trying to get property ‘post_type’ of non-object in /home2/mywebsite/public_html/wp-includes/class-wp-query.php on line 3871

Here’s my system status:

### WordPress Environment ###

Home URL: https://tenoon.id
Site URL: https://tenoon.id
WC Version: 3.5.3
Log Directory Writable: ?
WP Version: 5.0.3
WP Multisite: –
WP Memory Limit: 256 MB
WP Debug Mode: ?
WP Cron: ?
Language: en_US
External object cache: –

### Server Environment ###

Server Info: Apache
PHP Version: 7.2.13
PHP Post Max Size: 64 MB
PHP Time Limit: 300
PHP Max Input Vars: 1000
cURL Version: 7.62.0
OpenSSL/1.0.2k

SUHOSIN Installed: –
MySQL Version: 5.7.24
Max Upload Size: 64 MB
Default Timezone is UTC: ?
fsockopen/cURL: ?
SoapClient: ? Your server does not have the SoapClient class enabled - some gateway plugins which use SOAP may not work as expected.
DOMDocument: ?
GZip: ?
Multibyte String: ? Your server does not support the mbstring functions - this is required for better character encoding. Some fallbacks will be used instead for it.
Remote Post: ?
Remote Get: ?

### Database ###

WC Database Version: 3.5.3
WC Database Prefix: wp_
MaxMind GeoIP Database: ?
Total Database Size: 6.01MB
Database Data Size: 4.82MB
Database Index Size: 1.19MB
wp_woocommerce_sessions: Data: 0.03MB + Index: 0.00MB
wp_woocommerce_api_keys: Data: 0.00MB + Index: 0.01MB
wp_woocommerce_attribute_taxonomies: Data: 0.00MB + Index: 0.01MB
wp_woocommerce_downloadable_product_permissions: Data: 0.00MB + Index: 0.00MB
wp_woocommerce_order_items: Data: 0.01MB + Index: 0.01MB
wp_woocommerce_order_itemmeta: Data: 0.06MB + Index: 0.06MB
wp_woocommerce_tax_rates: Data: 0.00MB + Index: 0.01MB
wp_woocommerce_tax_rate_locations: Data: 0.00MB + Index: 0.00MB
wp_woocommerce_shipping_zones: Data: 0.00MB + Index: 0.00MB
wp_woocommerce_shipping_zone_locations: Data: 0.00MB + Index: 0.01MB
wp_woocommerce_shipping_zone_methods: Data: 0.00MB + Index: 0.00MB
wp_woocommerce_payment_tokens: Data: 0.00MB + Index: 0.00MB
wp_woocommerce_payment_tokenmeta: Data: 0.00MB + Index: 0.00MB
wp_woocommerce_log: Data: 0.00MB + Index: 0.00MB
wp_acrp_logs: Data: 0.00MB + Index: 0.00MB
wp_bilo_bank: Data: 0.02MB + Index: 0.00MB
wp_bilo_mutasi: Data: 0.02MB + Index: 0.00MB
wp_bilo_unik: Data: 0.02MB + Index: 0.00MB
wp_commentmeta: Data: 0.01MB + Index: 0.01MB
wp_comments: Data: 0.03MB + Index: 0.02MB
wp_ewwwio_images: Data: 0.09MB + Index: 0.06MB
wp_failed_jobs: Data: 0.02MB + Index: 0.00MB
wp_links: Data: 0.00MB + Index: 0.00MB
wp_mailchimp_carts: Data: 0.02MB + Index: 0.00MB
wp_options: Data: 1.49MB + Index: 0.08MB
wp_postmeta: Data: 1.75MB + Index: 0.54MB
wp_posts: Data: 0.93MB + Index: 0.09MB
wp_queue: Data: 0.02MB + Index: 0.00MB
wp_say_what_strings: Data: 0.00MB + Index: 0.00MB
wp_social_users: Data: 0.00MB + Index: 0.00MB
wp_termmeta: Data: 0.00MB + Index: 0.01MB
wp_terms: Data: 0.00MB + Index: 0.02MB
wp_term_relationships: Data: 0.04MB + Index: 0.08MB
wp_term_taxonomy: Data: 0.01MB + Index: 0.01MB
wp_usermeta: Data: 0.19MB + Index: 0.08MB
wp_users: Data: 0.01MB + Index: 0.01MB
wp_wcpdf_invoice_number: Data: 0.00MB + Index: 0.00MB
wp_wc_download_log: Data: 0.02MB + Index: 0.03MB
wp_wc_webhooks: Data: 0.02MB + Index: 0.02MB
wp_yith_wcwl: Data: 0.00MB + Index: 0.00MB
wp_yith_wcwl_lists: Data: 0.00MB + Index: 0.01MB
wp_yoast_seo_links: Data: 0.00MB + Index: 0.00MB
wp_yoast_seo_meta: Data: 0.01MB + Index: 0.01MB

### Post Type Counts ###

amn_mi-lite: 2
attachment: 344
blocks: 14
customize_changeset: 1
featured_item: 1
nav_menu_item: 15
page: 23
polylang_mo: 2
post: 4
product: 185
revision: 247
shop_coupon: 10
shop_order: 53
shop_order_refund: 1
wpcf7_contact_form: 5

### Security ###

Secure connection (HTTPS): ?
					Your store is not using HTTPS. Learn more about HTTPS and SSL Certificates.
Hide errors from visitors: ?

### Active Plugins (15) ###

Akismet Anti-Spam: by Automattic – 4.1
Contact Form 7: by Takayuki Miyoshi – 5.1.1
Facebook for WooCommerce: by Facebook – 1.9.8 – Not tested with the active version of WooCommerce
Messenger Customer Chat: by Facebook – 1.1
FooSales: by FooSales – 1.8.0 – Not tested with the active version of WooCommerce
Google Analytics for WordPress by MonsterInsights: by MonsterInsights – 7.4.1
Mailchimp for WooCommerce: by Mailchimp – 2.1.11 – Not tested with the active version of WooCommerce
Nextend Social Login: by Nextendweb – 3.0.14
W3 Total Cache: by Frederick Townes – 0.9.7
WooCommerce Indonesia Bank: by AgenWebsite – 1.0.2 – Not tested with the active version of WooCommerce
WooCommerce JNE Shipping ( Exclusive Version ): by AgenWebsite – 1.8.4
WooCommerce Kode Pembayaran ( Full Version ): by AgenWebsite – 1.1.2 – Not tested with the active version of WooCommerce
WooCommerce Konfirmasi Pembayaran: by AgenWebsite – 1.0.7 – Not tested with the active version of WooCommerce
WooCommerce: by Automattic – 3.5.3
WP Mail SMTP: by WPForms – 1.4.1

### Settings ###

API Enabled: ?
Force SSL: –
Currency: IDR (Rp)
Currency Position: left_space
Thousand Separator: ,
Decimal Separator: .
Number of Decimals: 0
Taxonomies: Product Types: external (external)
grouped (grouped)
simple (simple)
variable (variable)

Taxonomies: Product Visibility: exclude-from-catalog (exclude-from-catalog)
exclude-from-search (exclude-from-search)
featured (featured)
outofstock (outofstock)
rated-1 (rated-1)
rated-2 (rated-2)
rated-3 (rated-3)
rated-4 (rated-4)
rated-5 (rated-5)

### WC Pages ###

Shop base: #62 - /shop/
Cart: #61 - /cart/
Checkout: #60 - /checkout/
My account: #59 - /my-account/
Terms and conditions: ? Page not set

### Theme ###

Name: Flatsome Child
Version: 3.0
Author URL: 
Child Theme: ?
Parent Theme Name: Flatsome
Parent Theme Version: 3.7.2
Parent Theme Author URL: https://www.uxthemes.com/
WooCommerce Support: ?

### Templates ###

Overrides: flatsome/woocommerce/archive-product.php
flatsome/woocommerce/cart/cart-empty.php
flatsome/woocommerce/cart/cart-shipping.php
flatsome/woocommerce/cart/cart.php
flatsome/woocommerce/checkout/form-checkout.php
flatsome/woocommerce/checkout/form-coupon.php
flatsome/woocommerce/checkout/thankyou.php
flatsome/woocommerce/content-product.php
flatsome/woocommerce/content-product_cat.php
flatsome/woocommerce/content-single-product.php
flatsome/woocommerce/content-widget-product.php
flatsome-child/woocommerce/emails/customer-completed-order.php version 2.5.0 is out of date. The core version is 3.5.0
flatsome/woocommerce/global/breadcrumb.php
flatsome/woocommerce/global/quantity-input.php
flatsome/woocommerce/global/wrapper-end.php
flatsome/woocommerce/global/wrapper-start.php
flatsome/woocommerce/loop/loop-end.php
flatsome/woocommerce/loop/loop-start.php
flatsome/woocommerce/loop/orderby.php version 2.2.0 is out of date. The core version is 3.3.0
flatsome/woocommerce/loop/pagination.php
flatsome/woocommerce/loop/result-count.php
flatsome/woocommerce/loop/sale-flash.php
flatsome/woocommerce/myaccount/form-login.php
flatsome/woocommerce/myaccount/navigation.php
flatsome/woocommerce/notices/error.php
flatsome/woocommerce/notices/notice.php
flatsome/woocommerce/notices/success.php
flatsome/product-searchform.php version - is out of date. The core version is 3.3.0
flatsome/woocommerce/single-product/photoswipe.php
flatsome/woocommerce/single-product/price.php
flatsome/woocommerce/single-product/product-image.php
flatsome/woocommerce/single-product/product-thumbnails.php
flatsome/woocommerce/single-product/rating.php
flatsome/woocommerce/single-product/related.php
flatsome/woocommerce/single-product/review.php
flatsome/woocommerce/single-product/sale-flash.php
flatsome/woocommerce/single-product/share.php
flatsome/woocommerce/single-product/short-description.php
flatsome/woocommerce/single-product/tabs/tabs.php
flatsome/woocommerce/single-product/title.php
flatsome/woocommerce/single-product/up-sells.php
flatsome/woocommerce/single-product-reviews.php
flatsome/woocommerce/single-product.php

Outdated Templates: ?