yesyesman

Hello @steveneray,

We still face 500 error after 1.5.5 updates. It’s related to undefined PRODUCT_CODE_COLOR. We’ve fixed it temporarily. Hopes this can help.

[15-Dec-2025 04:40:06 UTC] PHP Fatal error: Uncaught Error: Undefined constant “PRODUCT_CODE_COLOR”
in wp-content/plugins/product-code-for-woocommerce/templates/product-meta-row.php:24

[15-Dec-2025 04:40:16 UTC] PHP Fatal error: Uncaught Error: Undefined constant “PRODUCT_CODE_COLOR”
in wp-content/plugins/product-code-for-woocommerce/templates/product-meta-row.php:24

🚨 Problem Report – Initial Symptoms

• Issue: HTTP 500 Internal Server Error on product pages
• Affected URL: https://shopreadsuniforms.com/shop/womens-scrubs/womens-scrub-jackets/megan-bonded-fleece-jacket-2023/
• Impact: All product pages returning 500 errors, preventing customer access
• Site Status: Homepage loading, but product pages completely broken

🔬 Root Cause AnalysisThe Problematic Code

File: wp-content/plugins/product-code-for-woocommerce/templates/product-meta-row.php Line: 24

<?php
// ... (lines 1-23)

$colorCode = get_post_meta($post->ID, PRODUCT_CODE_COLOR, true);  // ❌ LINE 24 - FATAL ERROR
//                                      ^^^^^^^^^^^^^^^^^
//                                      Undefined constant!

// ... rest of template
?>

Why This Failed

1. Undefined Constant: The code references PRODUCT_CODE_COLOR as a PHP constant (without quotes)
2. Expected Behavior: PHP constants must be defined using define('PRODUCT_CODE_COLOR', '_product_code_color')
3. Actual Behavior: The constant was never defined anywhere in the plugin
4. Result: PHP throws a Fatal Error, halting page execution → HTTP 500

Missing Constant:

PRODUCT_CODE_COLOR  // ❌ NOT DEFINED ANYWHERE

How the Variable Was Used

The $colorCode variable was being used later in the template to set inline CSS styling:

<!-- Line 37 -->
<span class="stl_codenum" style="color:<?php echo esc_html($colorCode); ?> !imortant">
    <?php echo esc_html(!$value ? __('N/A', 'product-code-for-woocommerce') : $value); ?>
</span>

<!-- Line 48 -->
<span class="stl_codenum_second" style="color:<?php echo esc_html($colorCode); ?> !imortant">
    <?php echo esc_html(!$value_second ? __('N/A', 'product-code-for-woocommerce') : $value_second); ?>
</span>

Purpose: Allows customization of product code text color via WordPress post meta.

✅ The Solution – Fix Implementation

Changed Line 24 from:

$colorCode = get_post_meta($post->ID, PRODUCT_CODE_COLOR, true);  // ❌ Undefined constant

To:

$colorCode = get_post_meta($post->ID, '_product_code_color', true);  // ✅ String literal

How to Prevent Similar Issues

Use Defensive Coding:

// Instead of:
$colorCode = get_post_meta($post->ID, PRODUCT_CODE_COLOR, true);

// Use:
$meta_key = defined('PRODUCT_CODE_COLOR') ? PRODUCT_CODE_COLOR : '_product_code_color';
$colorCode = get_post_meta($post->ID, $meta_key, true);