Need help with opencart xml import

Hello,
We are trying to import XML on Opencart 2.x.

Our server is on scalaway with CENTOS 7.2 and VESTA CP installed.

The error we get:

PHP Notice: Error: MySQL server has gone away<br />Error No: 2006<br />SELECT * FROM oc_profi_xml_import_tags WHERE import_id = '1' AND tag_name = 'products;product;cat4code' in /home/admin/web/bebece.net/public_html/system/library/db/mysqli.php on line 41
PHP Notice: Trying to get property of non-object in /home/admin/web/bebece.net/public_html/admin/model/tool/profi_import.php on line 472
PHP Warning: Invalid argument supplied for foreach(

How can we solve this?

Thank you for your help.
Regards