Error 500 when previewing the invoice in setup screen

[martignoni]

An error 500 occurs when previewing the invoice specimen in the setup screen. The PDF works however correctly when creating an invoice using the invoice module.

Steps to reproduce:

1. Install SwissQR module and activate it following instructions
2. On Setup -> Modules/Applications -> Invoices, click the Preview icon
3. Error 500 is displayed

Trace in error log:

2023/03/11 18:01:51 [error] 1893167#1893167: *1117659 FastCGI sent in stderr: "PHP message: PHP Fatal error:  Uncaught TypeError: Argument 1 passed to Sprain\SwissQrBill\DataGroup\Element\CombinedAddress::create() must be of the type string, null given, called in .../html/core/modules/facture/doc/pdf_swissqr.modules.php on line 928 and defined in .../html/core/modules/facture/doc/vendor/sprain/swiss-qr-bill/src/DataGroup/Element/CombinedAddress.php:54
Stack trace:
#0 .../html/core/modules/facture/doc/pdf_swissqr.modules.php(928): Sprain\SwissQrBill\DataGroup\Element\CombinedAddress::create()
#1 .../html/core/modules/facture/doc/pdf_swissqr.modules.php(860): pdf_swissqr->qrinvoice()
#2 .../html/admin/facture.php(112): pdf_swissqr->write_file()
#3 {main}
  thrown in .../html/core/modules/facture/doc/vendor/sprain/swiss-qr-bill/src/DataGroup/Element/CombinedAddress.php on line 54" while reading response header from upstream, client: 51.154.14.55, server: redacted, request: "GET /admin/facture.php?action=specimen&module=swissqr HTTP/2.0", upstream: "fastcgi://unix:/var/run/php/php7.4-fpm.sock:", host: "redacted", referrer: "https://redacted/admin/facture.php?save_lastsearch_values=1&backtopage=%2Fadmin%2Fmodules.php%3Fsearch_keyword%3Dfac"

Context:

• Dolibarr: 16.0.3
• Nginx: 1.18.0
• PHP: 7.4.33

PS. A big thank you for this (very useful) module ❤️