PrestaShop Troubleshooting

PrestaShop is a powerful ecommerce platform, but occasional issues can arise due to server configuration, module conflicts, theme customization, or software updates. Knowing how to diagnose and resolve common problems helps keep your online store running smoothly.

1. White Screen of Death (WSOD)

Possible causes:

• PHP fatal errors
• Insufficient memory
• Module conflicts
• Theme errors

Solutions:

• Enable debug mode.
• Check PHP error logs.
• Increase PHP memory limit.
• Disable recently installed modules.

2. 500 Internal Server Error

Possible causes:

• Incorrect .htaccess
• PHP version incompatibility
• File permission issues

Solutions:

• Regenerate the .htaccess file.
• Verify PHP compatibility.
• Check file permissions (644 for files, 755 for directories).
• Review server error logs.

3. Slow Website Performance

Possible causes:

• Large images
• Too many modules
• Slow hosting
• Disabled caching

Solutions:

• Enable Smarty caching.
• Compress images using WebP or AVIF.
• Use a CDN.
• Remove unused modules.
• Upgrade hosting if needed.

4. Module Installation Errors

Possible causes:

• Unsupported PrestaShop version
• Missing PHP extensions
• File upload limits

Solutions:

• Verify module compatibility.
• Enable required PHP extensions.
• Increase upload_max_filesize and post_max_size.
• Clear the cache after installation.

5. Login Problems

Possible causes:

• Incorrect credentials
• Browser cache
• Corrupted cookies
• Database issues

Solutions:

• Clear browser cookies and cache.
• Reset the password.
• Check database connectivity.
• Verify admin folder URL.

6. Email Not Sending

Possible causes:

• SMTP configuration errors
• Invalid sender address
• Firewall restrictions

Solutions:

• Test SMTP settings.
• Confirm sender email matches the authenticated SMTP account.
• Check mail server logs.
• Verify firewall and hosting email policies.

7. Image Upload Issues

Possible causes:

• File permissions
• Low PHP upload limits
• Unsupported image format

Solutions:

• Increase PHP upload limits.
• Verify folder permissions.
• Use supported image formats.
• Regenerate thumbnails after uploading.

8. Database Connection Errors

Possible causes:

• Incorrect database credentials
• Database server downtime
• Corrupted configuration

Solutions:

• Verify database username and password.
• Check database server availability.
• Review the database configuration file.
• Restore from backup if necessary.

9. Cache Problems

Symptoms:

• Design changes not visible
• Old content displayed

Solutions:

• Clear the PrestaShop cache.
• Disable cache temporarily during development.
• Clear browser and CDN caches.

10. SEO Issues

Common problems:

• Duplicate content
• Broken URLs
• Missing meta tags
• 404 errors

Solutions:

• Enable friendly URLs.
• Set canonical URLs.
• Add optimized titles and meta descriptions.
• Fix broken internal links.
• Submit an updated XML sitemap to search engines.

11. Upgrade Failures

Possible causes:

• Incompatible modules
• Server timeout
• Insufficient disk space

Solutions:

• Back up files and database before upgrading.
• Disable third-party modules temporarily.
• Verify PHP and MySQL requirements.
• Upgrade on a staging site first.

12. Security Issues

Best practices:

• Keep PrestaShop, modules, and themes updated.
• Enable HTTPS.
• Use strong administrator passwords.
• Remove unused modules.
• Monitor logs for suspicious activity.
• Schedule regular backups.

Troubleshooting Checklist

• ✔ Enable debug mode
• ✔ Review PHP and server logs
• ✔ Clear PrestaShop cache
• ✔ Verify PHP version compatibility
• ✔ Check file permissions
• ✔ Test with the default theme
• ✔ Disable recently installed modules
• ✔ Verify SMTP settings
• ✔ Backup before making changes
• ✔ Test fixes on a staging environment

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