Sogo Exception when trying to read an internal calendar invite

[infocilla]

Describe the bug

When sending an invitation to a calendar event from user1 of a Yunohost instance to user2 of the same instance, I'm not able to read the invitation email in user2's Sogo web interface.
In the Sogo service logs, I can read:
EXCEPTION: <NSException: 0x5610fcf8a840> NAME:NSInvalidArgumentException REASON:[NSString+stringWithString:]: NULL string INFO:(null)
and in the web interface, when I click on the email, it is infinitely loading.

Context

• Hardware: Bare Metal Desktop computer, 64 bits, Debian buster, 8G RAM, behind a domestic NAT
• YunoHost version: 4.3.6.3
• I have access to my server: Through SSH | through the webadmin | direct access via keyboard / screen
• Are you in a special context or did you perform some particular tweaking on your YunoHost instance?: no
• Using, or trying to install package version/branch:
• If upgrading, current package version: 4.0.7-1~ynh2

Steps to reproduce

• log into sogo interface with user1 and add a new event in the calendar inviting user2
• logout user1 and log in user2
• go to email view and click on the received invite

Expected behavior

Be able to open the invite and accept/reject it so that the calendar of user2 updates

Logs

See Describe the Bug

Screenshot

[florentdescroix]

Hi, I have the same issue.
As much as I've read on the net, it's linked to fact that there is no sender in the invites. And shall be fixed by the last version of SOPE.
I tryed to update Sogo (and sope) with the nighlty repository of Sogo, but it juts breaks everythings...

@infocilla have you got any better ?