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
✓ 7 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 relay. 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: 500 error, white screen, back-office inaccessible. Once back online, monthly maintenance prevents a relapse.
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 70€/h 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
monthlyplans
24/7 monitoring · 12-month commitment
- 24/7 monitoring of the site
- Daily automated backups
- Priority intervention included
- Critical security hotfixes applied
❓ 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.
Your site is down right now?
Reach us directly. 30-min diagnostic, firm quote stated up-front, intervention possible in stride.