Latest update breaks SDDM

[gonssal]

I couldn't see a way to post a bug for the PPA, so I'm using the contact
form.

After the latest update (5.5.3), SDDM stops working for me and I have to
manually startx everytime.

Dmesg:

[   18.577343] traps: sddm[2488] general protection ip:7f2343d0dfe3
sp:7ffde55cd600 error:0 in libQt5Core.so.5.5.1[7f2343a52000+4c5000]
[   20.312898] sddm[2871]: segfault at 400000006 ip 0000000400000006 sp
00007ffcb76b12c8 error 14 in locale-archive[7f935d049000+6af000]
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