InvoiceNinja has stopped showing previews

What app is this about, and its version: InvoiceNinja5 5.13.26~ynh1
What YunoHost version are you running: 12.1.40.1
What type of hardware are you using: Old laptop or computer

Describe your issue

I have been using InvoiceNinja for a while without any issues, but suddenly it no longer previews the Quote or Invoice. Everything else is working fine and as it should be… There were a few PHP updates lately; not sure if they have something to do with it…?

This is the error message when you try to view, download or print:

500: Internal Server Error • Unable to generate the raw PDF => The process has been signaled with signal “5”.

Does anyone else have this issue or a possible fix?

Many thanks

Dj

PS: There is something spooky going on. Suddenly I can’t update to the latest version of Nextcloud, Piwigo is misbehaving on image generation and now InvoiceNinja5… Ghost in the machine…

Share relevant logs or error messages

None to offer… Where would I look?