WooCommerce Errors

The error occurs once we update your plugin from 2.2.53 to 2.2.54

This is all the info I can give you: Theme: Divi

"wordpress": "6.8.3",
"active-plugins": [
{
"name": "Advanced Custom Fields PRO",
"version": "6.6.2"
},
{
"name": "BBQ Firewall",
"version": "20250324"
},
{
"name": "CartBounty - Save and recover abandoned carts for WooCommerce",
"version": "8.9"
},
{
"name": "Cloudflare",
"version": "4.13.0"
},
{
"name": "de_DE",
"version": "1.0.2"
},
{
"name": "Disable Application Passwords",
"version": "2.2"
},
{
"name": "Discount Rules for WooCommerce",
"version": "2.6.13"
},
{
"name": "Discount Rules PRO 2.0",
"version": "2.6.9"
},
{
"name": "F4 Salutation Fields for WooCommerce",
"version": "1.0.19"
},
{
"name": "F4 Shipping Phone and E-Mail for WooCommerce",
"version": "1.0.19"
},
{
"name": "F4 Simple Checkout Fields for WooCommerce",
"version": "1.0.15"
},
{
"name": "Fr Custom Payment Gateway Icon for WooCommerce",
"version": "1.1.2"
},
{
"name": "German Market",
"version": "3.52"
},
{
"name": "Gravity Forms",
"version": "2.9.21"
},
{
"name": "Gravity Forms Gutenberg Add-On",
"version": "1.0-rc-1.4"
},
{
"name": "Gravity Forms User Registration Add-On",
"version": "5.4.0"
},
{
"name": "Gravity Forms Zero Spam",
"version": "1.4.6"
},
{
"name": "GTM4WP - A Google Tag Manager (GTM) plugin for WordPress",
"version": "1.22.1"
},
{
"name": "Klaviyo",
"version": "3.7.2"
},
{
"name": "Mollie-Zahlungen für WooCommerce",
"version": "8.1.1"
},
{
"name": "Page-list",
"version": "5.9"
},
{
"name": "Pixel Manager for WooCommerce (Premium)",
"version": "1.49.3"
},
{
"name": "Print Invoice & Delivery Notes for WooCommerce",
"version": "5.8.0"
},
{
"name": "Safe SVG",
"version": "2.4.0"
},
{
"name": "Sequential Order Numbers for WooCommerce",
"version": "3.6.3.2"
},
{
"name": "SilentShield – Captcha & Anti-Spam für WordPress (CF7, WPForms, Elementor, WooCommerce)",
"version": "2.2.53"
},
{
"name": "Two Factor",
"version": "0.14.1"
},
{
"name": "Usercentrics Cookiebot - Automatic Cookie Banner for GDPR/CCPA & Google Consent Mode",
"version": "4.6.0"
},
{
"name": "User Role Editor",
"version": "4.64.5"
},
{
"name": "WebP Express",
"version": "0.25.9"
},
{
"name": "WooCommerce",
"version": "10.3.5"
},
{
"name": "WooCommerce.com Update Manager",
"version": "1.0.3"
},
{
"name": "WooCommerce Coupon Restrictions",
"version": "2.3.0"
},
{
"name": "WooCommerce Google Product Feed",
"version": "11.0.25"
},
{
"name": "WooCommerce PayPal Payments",
"version": "3.3.0"
},
{
"name": "WooCommerce Product Search",
"version": "6.11.0"
},
{
"name": "Woocommerce Side Cart Premium",
"version": "3.0"
},
{
"name": "WooCommerce Table Rate Shipping",
"version": "3.5.8"
},
{
"name": "Woo Essential",
"version": "3.11"
},
{
"name": "Wordfence Security",
"version": "8.1.2"
},
{
"name": "WPB Accordion Menu or Category PRO",
"version": "3.0.9"
},
{
"name": "WPC Variations Radio Buttons for WooCommerce",
"version": "3.7.2"
},
{
"name": "WP Mail SMTP",
"version": "4.7.0"
},
{
"name": "WPS Hide Login",
"version": "1.9.17.2"
},
{
"name": "WPS Limit Login",
"version": "1.5.9.2"
},
{
"name": "Yoast Duplicate Post",
"version": "4.5"
},
{
"name": "Yoast SEO",
"version": "26.3"
}
]
}

I created a pure WP Installation with Twenty-Twenty-Nineteen, WooCommerce and your Plugin.
Then I created a Variable Product.
Thats all you need to reproduce the error.

I also sent you an email with the local export of this pure installation.

https://ibb.co/Kxkz6NdF