When using the System Settings >> Online Accounts, the accounts listed show a "Configure" button on the right panel when selected. Clicking on the "Configure" button causes the System Settings application to crash and prevents online accounts from being used.

I first noticed this with pre-existing accounts (I updated from Kubuntu 15.04), so thought it was related. So I deleted the accounts and created new ones, but ran into the same problem.

Reproducible: Always

Steps to Reproduce:
1. Open System Settings
2. Go to Online Accounts
3. Select a pre-existing account or create a new one (I used Google)
4. Click the "Configure..." button on the right-side of the screen

Actual Results:  
System Settings crashes with a seg fault

Expected Results:  
I can actually configure my accounts without any problems

The accounts had stopped working for unknown reasons some months before the 15.04 -> 15.10 upgrade (without me changing credentials or anything), so something else must've changed and I don't know if has anything to do with, or has contributed to, the crash at this point or not. I just thought this was worth a mention, but might be a different bug.

Trying to get information from the terminal only gave me this bit of information...:

    $ systemsettings5
    Adding plugin KAccountsUiProvider(0x2596f30) "ktpaccountskcm_plugin_kaccounts.so"
     Adding service "IM"
    [1]    14718 segmentation fault (core dumped)  systemsettings5
    $ 

This segfault shows up after clicking the button. Creating and deleting accounts seemed to work normally.

The error reporter never showed up, so a stack trace was never available. Bug https://bugs.kde.org/show_bug.cgi?id=352217 seemed related, but it claims the crash happens *after* configuring an account and closing the System Settings. However, I cannot even get started; the configuration UI does not show up and it crashes immediately. It doesn't wait until I try to close the System Settings application to crash. These might be separate but closely-related issues.

System Information:
Kubuntu 15.10 64bit (upgraded from 15.04) using Breeze theme
System Settings
    Version 5.4.1
    KDE Frameworks 5.15.0
    Qt 5.4.2 (built against 5.4.2)