I'm trying to import customers to a Magento 2 website. Data validation is OK (File is valid! To start import process press "Import" button), but when I click on import button, page gets stuck on please wait loader and I get error :

POST https://www.my-domain.com/administration/admin/import/start/key/8adc97…ad82c7953b3d1041f73b2365f835465e6552bba89c2b456/&form_key=5VWWozeXbFPTNSAr 500 (Internal Server Error) validation.min.js:6

I also tried to export / import existing customers (3) to be sure I did not have wrong data in my csv or too many customers.

Folders have the right permissions.

I'm using Magento 2.1.7 on a dedicated Linux server.

I can't find what could be wrong here, any idea ?

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    I'd check the apache error log file. Error 500 means that literally everything could have gone wrong - from an error in a PHP file to a timeout of your proxy, if you're using nginx for example. If your CSV file is very large, I'd assume it's something about memory_limit, post_max_size or upload_max_size – simonthesorcerer Jun 4 '17 at 11:30
  • Yes, I was checking the logs right now. I have mod_fcgid: stderr: PHP Fatal error: Uncaught Error: Call to a member function getBackendModel() on null in /var/www/vhosts/my-domain.com/httpdocs/vendor/magento/module-customer-import-export/Model/Import/Customer.php:390, referer: my-domain.com/administration/admin/import/index/key/…. I also have this error with the small file I exported and tried ti reimport without any changes, with only 3 customers.. – David Jun 4 '17 at 11:39
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    I think customer attributes that have been added by you or an extension can cause this problem. – simonthesorcerer Jun 4 '17 at 11:42
  • Indeed, I added 2 customer attributes, one following link and one directly in database with phpmyadmin. The second one is causing the problem, I have to check what I did wrong there. Thanks a lot for you help. – David Jun 4 '17 at 11:52
  • I forgot to add the attribute in entity_attribute_id, problem soved ! Thanks again. – David Jun 4 '17 at 12:01

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