PrestaShop Module Fixes After Upgrade — PrestaShop 9 & Hummingbird

PrestaShop module fixes

We fix PrestaShop modules that broke after an upgrade

PrestaShop 8 or 9, a switch to the Hummingbird theme, or a module whose author no longer answers. We find the cause in the code, fix it on a copy of your store and move it live only after you’ve tested it.

Describe your problem mail_outline How it works ↓

Fixed quote before any work starts · English or Polish

# after upgrading to PrestaShop 9

PHP Fatal error: Call to undefined method Tools::displayPrice()

✓ fixed: $locale->formatPrice($price, $currencyIso)

# module configuration page, PrestaShop 8.1+

Warning: Undefined array key “is_default”

✓ fixed: language list completed for HelperForm

# Hummingbird theme, add to cart

Blockcart modal element not found in provided HTML

✓ fixed: module renders its own modal

  • 2011selling our modules on PrestaShop Addons
  • 4.7★average from 36 reviews
  • 900+downloads of our cart module
  • 1.7 · 8 · 9PrestaShop versions tested

Sounds familiar?

  • After the upgrade a module’s configuration page is blank or shows an error
  • The back office or a product page returns a 500 error
  • Prices, buttons or blocks disappeared from the front office
  • A module works on the Classic theme, but not on Hummingbird
  • The module’s author stopped releasing updates
  • You keep postponing the upgrade because you don’t know what will break

Not sure yet what will break? Run our free PrestaShop 9 compatibility checker on your modules first. It takes a minute and you can send us the report.

Planning the upgrade yourself? Start with our 12-step PrestaShop 1.7 to 9 upgrade checklist.

What we can help with

build

Fixing a broken module

We read the error, find the cause in the module’s code and fix it for your PrestaShop and PHP version.

fact_check

PrestaShop 9 readiness check

Before you upgrade, we go through your modules and give you a list: what works, what needs a patch, what is better replaced.

palette

Hummingbird theme fixes

Modules written for Classic often look or behave differently on Hummingbird, the default theme of PrestaShop 9. We adjust templates, CSS and JavaScript.

healing

Modules no longer updated

We patch a module its author no longer maintains, as long as its licence allows changes. We check that first.

extension

Small custom modules

One focused module instead of edits in theme or core files, so your changes survive the next update.

verified

Addons validation

For module developers: preparing a module for the PrestaShop Addons validator and compliance review.

How it works

  1. You describe the problemPrestaShop version, the module, what happens. An error message or a screenshot helps.
  2. You get a fixed quoteWe look at it, ask what we need, and send a price before any work starts.
  3. We fix it on a copyA staging store or a local copy of yours — never your live shop first.
  4. You test, we deployAfter your OK we move the fix to the live store and list every file we changed.
Block Sliding Cart side panel on a PrestaShop 9 store with the Hummingbird theme

We did this to our own module first

Block Sliding Cart has been on PrestaShop Addons since 2013. In 2026 we brought it to PrestaShop 1.7, 8 and 9 in one codebase and took it through the Addons validation again. Some of what that took:

  • Replacing core methods removed in PrestaShop 9
  • Four bugs that appeared only on the Hummingbird theme
  • A configuration page that failed the strict debug-mode review
  • Escaping every template variable for the security review

Read the full write-up, with code →

What you get

  • A fixed price agreed before the work starts
  • Work on a copy of your store, not on the live shop
  • A list of changed files and a short explanation of the cause
  • The fixed code is yours — no licence keys or subscriptions
  • Testing on your PrestaShop and PHP version
  • Direct contact with the person who writes the code

Who you will work with

Asymetria is a small web studio from Poland. We have built websites and online stores since 2007 and published our own PrestaShop modules on PrestaShop Addons since 2011. More about Asymetria.

Frequently asked questions

Will my PrestaShop 1.7 modules work on PrestaShop 9?

Some will, many need changes. Typical causes: methods removed from the core (for example Tools::displayPrice()), presenter classes moved to new namespaces, stricter admin templates, and front-office code that assumes the Classic theme. A readiness check tells you which modules are affected before you upgrade.

Do you work on my live store?

Not at first. We work on a copy — a staging store or a local copy — and move the fix to your live shop only after you have tested it.

Can you fix a module someone else wrote?

Yes, if its licence allows modifications. Many PrestaShop modules use the AFL or OSL licence, which does. If a licence does not allow it, we tell you before any work starts and suggest a replacement.

How much does it cost?

It depends on the module and the problem. Once we have seen it, you get a fixed quote, so there are no surprises on the invoice.

What do you need from me?

Your PrestaShop and PHP version (Advanced Parameters → Information), the module name and version or its ZIP file, the exact error message or a screenshot, and access to a staging store or a recent backup. If you ran our free compatibility checker, include its report as well.

Which languages do you work in?

English and Polish.

Tell us what’s wrong

A few sentences are enough: your PrestaShop version, the module, and what happens. We reply with questions or a quote.

E-mail us mail_outline

or write directly to info@asymetria.com.pl