01
Contact · 5 min
You describe the failure in a few sentences. We ask for the URL, the PrestaShop version, what you see. No 30-field form.
PrestaShop emergency · available now
Your PrestaShop store
Your PrestaShop store
is no longer responding?
Emergency PrestaShop support · rapid intervention
500 error, blank page, broken checkout, module crashing after an update… 30-min diagnostic, firm quote, intervention in stride. No ticket, no bot. You message, we answer.
✓ Certified PrestaShop Expert
✓ 6+ years · 120+ sites
✓ Response < 30 min
One of these symptoms? It rings a bell.
Click the one that matches, we handle the rest.
🚨 500 / 503 error
Internal server error, blank page
🛒 Checkout blocked
Customer can no longer pay
🧩 Module crashing
After update, conflict, fatal error
🐌 Store very slow
8+ seconds per page, customers leaving
🔒 Back-office down
Impossible to manage the store
🔄 Failed migration
1.7 → 8, broken data, modules KO
⚡ Process
From the call to the site back online, in 4 steps
No endless quote, no agency dispatching. You message us, we take the case, we keep you informed.
02
Diagnostic · 30 min
Reproduction of the failure, reading the error_log, PrestaShop debug and SQL slow queries. Exact cause identified, firm quote sent within 24 business hours.
03
Intervention
Backup of files + DB before any change, targeted fix, tests on the full checkout flow and back-office.
04
Written report
Root cause, fix applied, deeper actions recommended. You know what happened. 30-day warranty on the fix.
🔧 Technical scope
What we fix concretely
PrestaShop is a full ecosystem. To troubleshoot it fast, you have to know every layer.
PrestaShop core
core · hooks · overrides- Classes/controllers overrides crashing
- Hooks displayHeader, actionCart, displayPayment
- Smarty / templates / theme overrides
- config/defines.inc.php and parameters.php
Database
MySQL · MariaDB · repair- Corrupted tables (CHECK / REPAIR)
- Broken encoding (utf8mb4 / latin1)
- Duplicate IDs, FK constraints
- Slow query optimisation
Payment modules
Stripe · PayPal · Mollie · cards- Webhooks not received, invalid signatures
- Official module broken after update
- Double charges, statuses not synced
- 3DSecure / SCA broken
Server & PHP
memory · timeout · cache- memory_limit, max_execution_time
- OPcache / APCu / Redis
- File permissions (chmod / chown)
- Apache / Nginx / PHP-FPM logs
no PrestaShop failure is impossible to diagnose
💰 Pricing
Pricing stated up-front
Free diagnostic. For the intervention, you know exactly what it costs before we touch the code.
🔍 Diagnostic
Diagnostic
understand the failure
0€free
30 min · no commitment
- Reading the error_log + reproduction
- Exact cause identified
- Firm quote sent immediately
- You decide if we continue
⚡ Most requested
🔧 Intervention
Targeted intervention
fix the failure, fast
from 60€excl. VAT
per diagnostic · price stated up-front
- Backup of files + DB before intervention
- Targeted fix of the failure
- Tests on full checkout flow
- Written report: cause + fix
- 30-day warranty on the fix
🛡️ Maintenance
Monthly maintenance
never relive a failure
from 50€/ month
24/7 monitoring · no commitment
- 24/7 monitoring of the site
- Daily automated backups
- Priority intervention included
- Critical security hotfixes applied
💬 Client feedback
What those we've already rescued say
Site went down on a Sunday evening, right after an install I'd tried to do on my own. I could see orders piling up without being able to follow them. I sent a message, got an answer. The site was back online before the end of the film we were watching.
We were launching our Google Ads Christmas campaign and the site went down three times in one day. My previous developer kept saying "let's see at the next meeting". This time, it was fixed in under an hour. I could restart the campaign that very evening.
My former agency had launched a migration and broken everything. Three weeks living with a broken site and unanswered calls. Here, everything was explained simply, the project was picked back up and finished in 4 days. No orders lost. I don't regret it.
❓ FAQ
The real questions about emergency support
30 minutes on average. We ask for your site URL and admin credentials, reproduce the failure, read the server logs (
error_log, PrestaShop debug, mysql slow query) and identify the exact cause. You receive a firm quote with the intervention timeline. The diagnostic is free.All versions still in production: 1.6, 1.7, 8.x and 9.x. KLN-WEB is certified PrestaShop Expert CORE SKILLS, with deep knowledge of the differences between generations, hooks, the override system and classic pitfalls (override, smarty cache,
ps_configuration table, etc.).Don't touch anything if you're not sure — every undocumented change makes the diagnostic harder. Enable PrestaShop debug mode if you have access (
config/defines.inc.php · _PS_MODE_DEV_ = true), grab the contents of error_log at the root and send everything. We intervene directly on the server.In 80% of cases: a payment module incompatible with the PrestaShop version after an update, a broken
displayPaymentByBinaries hook, a JavaScript conflict on the order-confirmation page, or a misconfigured shipping rule. We check these 4 points first, then the Stripe / PayPal / Mollie logs depending on the payment method.The diagnostic is free. The intervention rate depends on the scope identified during the diagnostic and is stated up-front, never afterwards. For common failures (500 error, module to restore, broken hook), expect €60 to €180 excl. VAT. For heavier work (corrupted DB, broken migration, hacked site), detailed quote.
Yes, we handle emergencies outside business hours. A store crashing on a Saturday night costs more than the intervention — we know it. Send a WhatsApp message and we respond quickly.
🔗 Related topics
Other issues I handle
Your site is down right now?
Reach us directly. 30-min diagnostic, firm quote stated up-front, intervention possible in stride.