Forwarded to devs Error when I try to make backup

[fgangneux]

TITLE:

Error when I try to make backup​

PRODUCT, VERSION, OPERATING SYSTEM, ARCHITECTURE:

Plesk Onyx 17.8.11 Update #11 (Web admin edition)
Debian 8.10
Remote storage : FTP Ready to use​

PROBLEM DESCRIPTION:

When I try to make a backup in the Web Admin Edition, I get this error :
The backup process failed: Some fields are empty or contain an improper value.​

STEPS TO REPRODUCE:

Tools & Settings > Backup Manager > Back Up the Server
URL: /admin/backup/backup/

Content: All configuration and content except mail
Store in: FTP storage at (myftpserver)/(dir)/ <--- as expected
Type: Full
Create a multivolume backup, 2047 MB : Yes

button OK​

ACTUAL RESULT:

Back to previous screen
URL: /admin/backup/list/

The backup doesn't start and show this message in red:
The backup process failed: Some fields are empty or contain an improper value.​

EXPECTED RESULT:

The backup start as expected​

ANY ADDITIONAL INFORMATION:

I tried too making backup by domain: URL: /smb/backup/list/domainId/3
with the same result
I tried too some diferent FTP config:
Passif mode on/off, FTPS On/OFF, with and without folder or trailing slash ...
nothing work​

YOUR EXPECTATIONS FROM PLESK SERVICE TEAM:

Help with sorting out​

 

[Nsowner]

Plesk published a hotfix yesterday you can apply via SSH.

Unable to create backup under the customer: Some fields are empty or contain an improper value

 

[fgangneux]

Worked for me, thanks!