Deleting the non-existing printer from printers helped:
1) Delete print-manager 
$ apt-get remove print-manager
2) Start plasma
sudo service sddm restart
or
kstart plasmashell
3) Install print-manager back again
$ apt-get install print-manager
4) Open Printers
Alt-F2 -> Printers
Remove the not used printers or all of them and then install the used ones.

"Fixed"
A software fix is still necessary.

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https://bugs.launchpad.net/bugs/1770044

Title:
  plasmashell crashes on login - so I can't use my desktop system.

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