Ah, perfect!
Thank you 
Posts by rebelt2i
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Hello,
I am using Debian 8.6, wanted to upgrade from 1.4.6 to 1.4.7
- I used the auto-installer to upgrade i-MSCP, then two times the "undefined value" error occured.
- I am using the PHPSwitcher and LetsEncrypt plugins.
(Edit: I have used an older version of LetsEncrypt 3.2.* and updated it now, maybe I can test later, if this is the reason for the bug.)