Hello guys welcome back to my blog therichpost.com. Today in this blog post we will Fix “Cannot Read Properties of Null (Reading ‘submit’)” Error in WooCommerce Checkout – Complete Solution Guide.

Guys if you are new in  WordPress or in  WooCommerce then please check the below links for some good tutorials:

1. WooCommerce Hooks
2. WordPress Tricks
3. WordPress Hooks
4. Dokan

⚠️ Common Reasons This Error Happens in WooCommerce

1️⃣ JavaScript Running on Non-Checkout Pages

Scripts written for checkout are executed globally (home, cart, product pages), where the checkout form does not exist.

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2️⃣ Checkout Form Removed or Modified

Custom themes or overridden WooCommerce templates may remove or rename:

<form class="checkout">

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3️⃣ Plugin Conflicts (Very Common)

Payment gateways, crypto payment plugins, or custom checkout plugins often override submit behavior improperly.

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4️⃣ Script Loads Before DOM Is Ready

JavaScript runs before WooCommerce finishes rendering the checkout form.

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5️⃣ Custom or Headless Checkout Pages

If you created a custom checkout layout without WooCommerce’s required structure, built-in scripts fail.

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How to Fix the Error (Step-by-Step Solutions)

✅ Solution 1: Always Check If the Form Exists

Vanilla JavaScript

const checkoutForm = document.querySelector('form.checkout');

if (checkoutForm) {
  checkoutForm.addEventListener('submit', function () {
    // safe code here
  });
}

✅ Solution 2: Load Scripts Only on Checkout Page

Add this to functions.php:

add_action('wp_enqueue_scripts', function () {
  if (is_checkout()) {
    wp_enqueue_script(
      'custom-checkout-js',
      get_stylesheet_directory_uri() . '/js/checkout.js',
      ['jquery'],
      null,
      true
    );
  }
});

✅ Solution 3: Use DOM Ready Wrapper (Recommended)

jQuery(function ($) {
  const $form = $('form.checkout');
  if (!$form.length) return;

  $form.on('submit', function () {
    // checkout logic
  });
});

✅ Solution 4: Debug Plugin Conflicts

1. Disable all plugins except WooCommerce
2. Test checkout
3. Enable plugins one by one
4. Identify the conflicting plugin

⚠️ Payment & crypto plugins are frequent causes

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Best Practices to Avoid This Error

• Never run checkout JavaScript globally
• Always check DOM elements before using them
• Avoid unnecessary template overrides
• Test checkout after installing new plugins
• Load scripts conditionally

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✅ Final Thoughts

The “Cannot read properties of null (reading ‘submit’)” error is not a WooCommerce bug—it’s a JavaScript logic issue caused by missing elements or incorrect script execution.

Once you fix the root cause, your checkout becomes stable, fast, and error-free.

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Guys if you have any query then feel free to contact me anytime via contact us page.

Ajay Thanks