==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.4.2
- Deployed with iRedMail Easy or the downloadable installer? Downloadable installer (0.9.x)
- Linux/BSD distribution name and version: Debian 9
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): PGSQL
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? No
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

I've left my iRedMail installation unupgraded for a while, but today I decided to upgrade to the latest. It all worked well between 1.3.2 and 1.4.2, but when I tried to upgrade to 1.5.0, the upgrade of Roundcube doesn't exactly work. The script runs fine, but then when I load the Webmail UI, no email appears on the list and I get the following error in the browser console:

Uncaught (in promise) Error: The message port closed before a response was received.

The thing is, in the upgrade guide there's also an SQL correction for MySQL but not for PGSQL, and I wonder whether one was necessary but was missed.

Or, alternatively, if something else is wrong, where iRedMail is the cause.

Note that I've tried to upgrade Roundcube on its own before, and I've encountered the exact same error, but since I didn't upgrade iRedMail too, I thought perhaps there was something in the iRedMail upgrade that I was missing. But now I performed the iRedMail upgrade too so I wonder what's up!

EDIT: I forgot to say one thing: I'm on Debian 9 (stretch), so I also couldn't perform the Nginx part of the upgrade from iRedMail 1.4.2 to 1.5.0. Perhaps that plays a role.