Hello @hafizawani8a0d,
The error "Call to a member function getItemId() on null", suggests that the getItemId() function is being called on a variable or object that is null. This usually happens when the system expects a value but doesn't get one, potentially due to a missing or incorrect data load.
The error points to line 174 of /var/www/html/magento2/app/code/Fbl/AdvanceReports/Model/Export/ConvertToCsv.php.
Review this line to see which object is calling the getItemId() function. It's likely that the object being referenced is not properly instantiated or loaded.
Ensure that the item (which is likely a product, order, or other entity) is being properly loaded before the getItemId() function is called. Make sure that $item or the object in question is not null before you call getItemId().
If you're uncertain whether the object is being loaded, add a null check around the getItemId() call.
The issue could stem from the fact that the data (likely a grid collection) is not being passed correctly from the controller to the ConvertToCsv.php model. Check how the data is being fetched from the database or other sources. Ensure that the grid data is not empty when performing the export.
Check the export logic in getCsvFile(). If this function processes a collection or an array of items, make sure that the items are being fetched properly. Look for any faulty logic or incorrect filtering that might result in empty or missing items during the export.
Enable Magento Logs for Debugging:
- Enable logging in Magento to capture more detailed information about the request. You can add a log just before the failing line:
$this->logger->debug('Exporting CSV, Item: ' . var_export($item, true));
after put this log you can check thee log entry in var/log/debug.log
make sure your website is in develeoper mode.
Clear Cache: If you made changes, clear Magento's cache to ensure your changes take effect:
php bin/magento cache:clean
php bin/magento cache:flush
Check Permissions: Make sure that all necessary files have the correct permissions, especially if any changes were recently made.
By following these instructions, you should be able to diagnose the problem and prevent the null object issue during the export process.
If the issue will be resolved, Click Kudos & Accept as a Solution.
