Synergy: ssl certificate doesn't exist?

I have installed Synergy v1.8.8 on my Ubuntu. It works fine as a server until the next reboot. Once I restart the machine, it shows the following errors:

[2020-02-14T11:58:08] ERROR: ssl certificate doesn't exist: /.synergy/SSL/Synergy.pem /build/synergy-iliE6X/synergy-1.8.8-stable+dfsg.1/src/lib/net/SecureSocket.cpp,617

The only workaround I found so far is to reinstall Synergy. Then works fine (until the next reboot).

How can I fix it pernamently?

Edit #1: The interesting thing is that /.synergy/SSL/Synergy.pem is not present at all, both in situation when Synergy manages to start and in situation when it fails.

Edit #2: Here's synergy.conf I use:

section: screens X: halfDuplexCapsLock = false halfDuplexNumLock = false halfDuplexScrollLock = false xtestIsXineramaUnaware = false switchCorners = none switchCornerSize = 0 Y: halfDuplexCapsLock = false halfDuplexNumLock = false halfDuplexScrollLock = false xtestIsXineramaUnaware = false switchCorners = none switchCornerSize = 0
end
section: aliases
end
section: links X: right = Y Y: left = X
end
section: options relativeMouseMoves = false screenSaverSync = true win32KeepForeground = false clipboardSharing = true switchCorners = none switchCornerSize = 0
end

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