Hi,
I tried to upgrade Invoice Ninja with PHP 7.2 running.
The upgrade script has alerted me that mcrypt is missing so I reported this error to the invoice ninja team that alerted me they are no more using mcrypt.
We have removed the mcrypt requirement check from Invoice Ninja earlier today.
Please execute Softaculous cron command on our server to get the updated package.
Should you face any further issues, please feel free to contact us.