A 500 Internal Server Error in the PrestaShop admin panel usually indicates a server-side issue affecting the back office only, while the storefront may still work normally.
In many cases, the issue is caused by corrupted or outdated cache data generated by PrestaShop.
Table of Contents
Most common cause
One of the most frequent reasons for this error is incorrectly cached files in the PrestaShop cache directory. When cache data becomes inconsistent, the admin panel may fail to load and return a 500 error.
How to fix the issue
1. Access your server via FTP
Connect to your hosting account using an FTP client (for example FileZilla) and navigate to your PrestaShop installation directory.
If you are unsure how to connect via FTP, refer to your FTP client documentation.
2. Locate the cache directory
Go to the following path:
/var/cache
3. Rename the cache folder
Rename the folder:
cache → cache1
This action does not delete data. It simply disables the current cache folder and forces PrestaShop to regenerate fresh cache files automatically.
4. Test the admin panel
After renaming the folder, try accessing the PrestaShop admin panel again. The system should rebuild the cache and restore normal functionality.
Practical implications
- Renaming the cache folder is safe and non-destructive
- PrestaShop will automatically recreate required cache files
- This fix is commonly used for resolving admin panel access issues
- The storefront is usually not affected by this error
Summary
A 500 error in the PrestaShop admin panel is often caused by corrupted cache data. Renaming the /var/cache folder forces PrestaShop to regenerate cache files, which typically restores access to the admin interface.