PHP warning in server logs

Hello @lozula,

I tried to recreate this issue, but nothing happens like that.

Please send us a WooCommerce system status. Here’s a screenshot showing how to get it.

It’ll help us to resolve the issue faster.

Best regards,
Marta

Here you go:

### WordPress Environment ###

WordPress address (URL): https://travelphotographycourse.com
Site address (URL): https://travelphotographycourse.com
WC Version: 3.9.2
REST API Version: ? 1.0.7
Log Directory Writable: ?
WP Version: 5.3.2
WP Multisite: –
WP Memory Limit: 256 MB
WP Debug Mode: –
WP Cron: ?
Language: en_US
External object cache: ?

### Server Environment ###

Server Info: Apache/2.4.10 (Debian)
PHP Version: 7.3.14-1+0~20200123.51+debian8~1.gbpcf42df
PHP Post Max Size: 20 MB
PHP Time Limit: 60
PHP Max Input Vars: 2500
cURL Version: 7.38.0
OpenSSL/1.0.1t

SUHOSIN Installed: –
MySQL Version: 5.6.47-87.0-log
Max Upload Size: 20 MB
Default Timezone is UTC: ?
fsockopen/cURL: ?
SoapClient: ?
DOMDocument: ?
GZip: ?
Multibyte String: ?
Remote Post: ?
Remote Get: ?

### Database ###

WC Database Version: 3.9.2
WC Database Prefix: wp_
Total Database Size: 33.36MB
Database Data Size: 23.89MB
Database Index Size: 9.47MB
wp_woocommerce_sessions: Data: 0.13MB + Index: 0.02MB + Engine InnoDB
wp_woocommerce_api_keys: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
wp_woocommerce_attribute_taxonomies: Data: 0.02MB + Index: 0.02MB + Engine InnoDB
wp_woocommerce_downloadable_product_permissions: Data: 0.02MB + Index: 0.06MB + Engine InnoDB
wp_woocommerce_order_items: Data: 0.02MB + Index: 0.02MB + Engine InnoDB
wp_woocommerce_order_itemmeta: Data: 0.06MB + Index: 0.03MB + Engine InnoDB
wp_woocommerce_tax_rates: Data: 0.02MB + Index: 0.06MB + Engine InnoDB
wp_woocommerce_tax_rate_locations: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
wp_woocommerce_shipping_zones: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
wp_woocommerce_shipping_zone_locations: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
wp_woocommerce_shipping_zone_methods: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
wp_woocommerce_payment_tokens: Data: 0.02MB + Index: 0.02MB + Engine InnoDB
wp_woocommerce_payment_tokenmeta: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
wp_woocommerce_log: Data: 0.02MB + Index: 0.02MB + Engine InnoDB
wp_aelia_dismissed_messages: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
wp_aelia_exchange_rates_history: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
wp_cmplz_cookiebanners: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
wp_cmplz_cookies: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
wp_cmplz_dnsmpd: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
wp_cmplz_services: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
wp_cmplz_statistics: Data: 0.09MB + Index: 0.00MB + Engine InnoDB
wp_commentmeta: Data: 0.45MB + Index: 0.45MB + Engine InnoDB
wp_comments: Data: 1.45MB + Index: 1.38MB + Engine InnoDB
wp_followup_coupons: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
wp_followup_coupon_logs: Data: 0.02MB + Index: 0.05MB + Engine InnoDB
wp_followup_customers: Data: 0.02MB + Index: 0.06MB + Engine InnoDB
wp_followup_customer_carts: Data: 0.05MB + Index: 0.03MB + Engine InnoDB
wp_followup_customer_notes: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
wp_followup_customer_orders: Data: 0.02MB + Index: 0.02MB + Engine InnoDB
wp_followup_email_excludes: Data: 0.02MB + Index: 0.05MB + Engine InnoDB
wp_followup_email_logs: Data: 0.02MB + Index: 0.05MB + Engine InnoDB
wp_followup_email_orders: Data: 0.02MB + Index: 0.09MB + Engine InnoDB
wp_followup_email_tracking: Data: 0.02MB + Index: 0.08MB + Engine InnoDB
wp_followup_followup_history: Data: 0.13MB + Index: 0.05MB + Engine InnoDB
wp_followup_order_categories: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
wp_followup_order_items: Data: 0.02MB + Index: 0.05MB + Engine InnoDB
wp_followup_subscribers: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
wp_followup_subscribers_to_lists: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
wp_followup_subscriber_lists: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
wp_links: Data: 0.02MB + Index: 0.02MB + Engine InnoDB
wp_mailchimp_carts: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
wp_mailchimp_jobs: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
wp_options: Data: 2.13MB + Index: 0.06MB + Engine InnoDB
wp_pimwick_gift_card: Data: 0.02MB + Index: 0.02MB + Engine InnoDB
wp_pimwick_gift_card_activity: Data: 0.02MB + Index: 0.02MB + Engine InnoDB
wp_postmeta: Data: 3.39MB + Index: 1.86MB + Engine InnoDB
wp_posts: Data: 12.06MB + Index: 0.72MB + Engine InnoDB
wp_termmeta: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
wp_terms: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
wp_term_relationships: Data: 0.08MB + Index: 0.06MB + Engine InnoDB
wp_term_taxonomy: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
wp_usermeta: Data: 2.52MB + Index: 3.03MB + Engine InnoDB
wp_users: Data: 0.31MB + Index: 0.30MB + Engine InnoDB
wp_wc_admin_notes: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
wp_wc_admin_note_actions: Data: 0.02MB + Index: 0.02MB + Engine InnoDB
wp_wc_category_lookup: Data: 0.02MB + Index: 0.00MB + Engine InnoDB
wp_wc_customer_lookup: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
wp_wc_download_log: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
wp_wc_order_coupon_lookup: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
wp_wc_order_product_lookup: Data: 0.02MB + Index: 0.06MB + Engine InnoDB
wp_wc_order_stats: Data: 0.02MB + Index: 0.05MB + Engine InnoDB
wp_wc_order_tax_lookup: Data: 0.02MB + Index: 0.03MB + Engine InnoDB
wp_wc_product_meta_lookup: Data: 0.02MB + Index: 0.09MB + Engine InnoDB
wp_wc_tax_rate_classes: Data: 0.02MB + Index: 0.02MB + Engine InnoDB
wp_wc_webhooks: Data: 0.02MB + Index: 0.02MB + Engine InnoDB

### Post Type Counts ###

attachment: 506
condition_group: 2
course: 1
customize_changeset: 5
follow_up_email: 3
lesson: 65
nav_menu_item: 7
page: 18
post: 2
product: 2
quiz: 63
revision: 283
scheduled-action: 1037
shop_coupon: 21
shop_order: 34
sidebar: 2
wc_membership_plan: 1
wc_user_membership: 2184
wp_block: 3

### Security ###

Secure connection (HTTPS): ?
Hide errors from visitors: ?

### Active Plugins (25) ###

ManageWP - Worker: by GoDaddy – 4.9.3
Better Search Replace: by Delicious Brains – 1.3.3
Breeze: by Cloudways – 1.1.2
Complianz Privacy Suite (GDPR/CCPA) premium: by RogierLankhorst
Complianz – 4.3.1

Content Aware Sidebars: by Joachim Jensen - DEV Institute – 3.11.1
Flexible Checkout Fields: by WP Desk – 2.3.1
Lazy Loader: by Florian Brinkmann
MarcDK – 6.0.0

Members: by MemberPress – 2.2.0
reSmush.it Image Optimizer: by reSmush.it – 0.3.0
Sensei LMS Course Progress: by Automattic – 2.0.2
Stackable - Gutenberg Blocks (Premium): by Gambit Technologies
Inc – 2.2.1

Ultimate Addons for Gutenberg: by Brainstorm Force – 1.14.6
WooCommerce Admin: by WooCommerce – 0.25.1
WooCommerce Conversion Tracking: by Tareq Hasan – 2.0.6 – Not tested with the active version of WooCommerce
WooCommerce EU VAT Number: by WooCommerce – 2.3.18
Follow-Up Emails: by WooCommerce – 4.8.25
WooCommerce PayPal Checkout Gateway: by WooCommerce – 1.6.20
WooCommerce Stripe Gateway: by WooCommerce – 4.3.2
WooCommerce Google Analytics Integration: by WooCommerce – 1.4.17
WooCommerce Memberships: by SkyVerge – 1.17.0
WooCommerce Price Based on Country Pro Add-on: by Oscar Gare – 2.8.6
WooCommerce Price Based on Country (Basic): by Oscar Gare – 1.8.22
WooCommerce Smart Coupons: by StoreApps – 4.6.0
WooCommerce: by Automattic – 3.9.2
Sensei with WooCommerce Paid Courses: by Automattic – 2.4.0.1.2.4 – Not tested with the active version of WooCommerce

### Inactive Plugins (4) ###

Cache Images: by Matt Mullenweg – 3.1
Limit Login Attempts Reloaded: by WPChef – 2.10.0
Query Monitor: by John Blackbourn – 3.5.2
Regenerate Thumbnails: by Alex Mills (Viper007Bond) – 3.1.3

### Dropin Plugins (2) ###

advanced-cache.php: advanced-cache.php
object-cache.php: Memcachy

### Must Use Plugins (1) ###

ManageWP - Worker Loader: by GoDaddy –

### Settings ###

API Enabled: –
Force SSL: –
Currency: USD ($)
Currency Position: left
Thousand Separator: ,
Decimal Separator: .
Number of Decimals: 2
Taxonomies: Product Types: external (external)
grouped (grouped)
pw gift card (pw-gift-card)
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)

Connected to WooCommerce.com: ?

### WC Pages ###

Shop base: #207 - /shop/
Cart: #208 - /cart/
Checkout: #209 - /checkout/
My account: #210 - /my-account/
Terms and conditions: ? Page not set

### Theme ###

Name: Travel Photography Course
Version: 1.0.96
Author URL: https://www.findingtheuniverse.com
Child Theme: ?
Parent Theme Name: Storefront
Parent Theme Version: 2.5.4
Parent Theme Author URL: https://woocommerce.com/
WooCommerce Support: ?

### Templates ###

Overrides: PhotographyCourseTheme/woocommerce/checkout/form-checkout.php
PhotographyCourseTheme/woocommerce/checkout/review-order.php
PhotographyCourseTheme/woocommerce/emails/customer-completed-order.php

### Memberships ###

Restriction mode:: Redirect to page
Public content:: –
Excluded from discounts:: –
Membership plans:: 1
Travel Photography Course Member:: Members: 2184Access method: Product(s) purchaseAccess length: Unlimited ? The plan contains a rule to restrict all Lessons to non-members

### Geolocation debug info ###

Default customer location: geolocation_ajax
MaxMind GeoIP database: ?
MaxMind GeoIP license: ?
: 
HTTP_CF_IPCOUNTRY: GB
GEOIP_COUNTRY_CODE: ?
HTTP_X_COUNTRY_CODE: ?
HTTP_X_REAL_IP: 86.153.249.81
HTTP_X_FORWARDED_FOR: 86.153.249.81
REMOTE_ADDR: 86.153.249.81
Real external IP: 86.153.249.81
WCPBC_USE_REMOTE_ADDR: –
Geolocation Test: ?

### PBC Settings ###

Version: 1.8.22
Base location: GB
Base currency: USD
Price Based On: billing
Shipping: –
Test mode: –
Test country: –
Load products price in background: –
Currency format: [symbol][price]
Prices entered with tax: ?
Calculate tax based on: shipping
Display prices in the shop: incl

### Zone Pricing Eurozone ###

zone_id: eurozone
name: Eurozone
countries: AX | AD | AT | BE | CY | EE | FI | FR | GF | TF | DE | GR | GP | IE | IT | LV | LT | LU | MT | MQ | YT | MC | ME | NL | PT | RE | BL | MF | PM | SM | SK | SI | ES | VA
currency: EUR
exchange_rate: 1
auto_exchange_rate: no
exchange_rate_fee: 0
round_nearest: 
currency_format: 
price_thousand_sep: ,
price_decimal_sep: .
price_num_decimals: 2
disable_tax_adjustment: no

### Zone Pricing United Kingdom ###

zone_id: united-kingdom
name: United Kingdom
countries: GB
currency: GBP
exchange_rate: 1
auto_exchange_rate: no
exchange_rate_fee: 0
round_nearest: 
currency_format: 
price_thousand_sep: ,
price_decimal_sep: .
price_num_decimals: 2
disable_tax_adjustment: no

### Action Scheduler ###

Complete: 1,034
Oldest: 2020-01-21 20:08:18 +0000
Newest: 2020-02-21 14:26:02 +0000

Pending: 3
Oldest: 2020-02-21 15:26:02 +0000
Newest: 2020-02-21 20:05:46 +0000

Canceled: 0
Oldest: –
Newest: –

In-progress: 0
Oldest: –
Newest: –

Failed: 0
Oldest: –
Newest: –

Hello @lozula,

Thank you.

The problem might be with your theme. Please test the plugin again, but now using Storefront – official WooCommerce theme. It will help us identify a possible conflict with your theme.

Please let me know if the issue still occurs on Storefront.

Best regards,
Marta

Hello,

I haven’t significantly changed the theme. It’s just a child version of Storefront with different css. I don’t see how it would make this error happen.

I think it is much more likely to be the EU VAT plugin from Woocommerce, as that adds a field to the checkout page, and line 604 of this plugin is specifically about extra fields added by other plugins.

Laurence

Hello @lozula,

We are not able to recreate this issue, so it will be helpful if you check this issue on the Storefront theme.

Best regards,
Marta

@lozula,

We can’t define where is the issue…
It seems that the problem is related to some other plugin used in your shop, maybe it’s not the EU VAT plugin.

Have you tried to isolate the issue? Please disable all third-party plugins in your WordPress and try again. Only with Flexible Checkout Fields and WooCommerce, and step by step turn on the other plugins to check where exactly the issue occurs.

Best regards,
Marta

Hi Marta,

Just to let you know I have identified the issue. There was another piece of code trying to arrange the checkout fields, which was conflicting. When removing the code, it resolved the issue.

Thanks for your time!

Laurence