Export grid to .xlsx file stops at 99%

I cannot export data from the grid to .xlsx-Format. The export stopps at 99%.
The following changes have already been made: increase memory_limit in php.ini and add 777 rights to my Temp folder (/_lib/tmp).
I am using a Postgresql database.
Any suggestions to fix this problem are welcome.

Problem solved for Sabina. The zip-Module was neither installed nor activated for her PHP-Version. :slight_smile: