Error during export using Portico plugin

Hello everyone!

On OJS, using the Portico plugin (Version, when I click on the ‘Export Issues’ button, I have this kind of error:

PHP Warning:  ZipArchive::getStatusString(): Invalid or uninitialized Zip object
              in /plugins/importexport/portico/ on line 174
PHP message: Unable to create Portico ZIP: ', referer:

Following the instructions on this link:

I’ve resolved adding the instruction:


at line 172 of the file ‘’. Do you know anything about that? Is it due to the php version (I’m using 7.3), an incorrect configuration or a bug of some kind?

Thank you very much for any hint