Originally filed at:
  https://bugzilla.redhat.com/show_bug.cgi?id=1101037

Original version was 2.4.15, reporter reproduced it on 2.6.3 as well.

...
My Discover card had to be re-issued with a new account number. So I tried to change the account number in aqbanking.

I did this:

1. Tools > Online Banking Setup..
2. Started the AqBanking Wizard
3. Went to the Accounts tab
4. Deleted the old Discover account
5. Went to the Users tab
6. Selected the Discover Card user, pressed the Edit User button.
7. Went to the Bank Setting tab
8. Pressed Retrieve Accounts List..seemed to go through successfully.
   The new account number came through.
9. Closed the Wizard
10. Pressed the "Forward" button..CRASH

Gnucash continues to crash everytime I try to go ahead past the Forward in order to set up the Account with the new online banking information.

If I try Actions > Online Actions on my Discover account, it crashes.

All my other on-line accounts Online Actions still work!!

I tried "aqbanking-cli request .. --balance" on the new Discover Card account name and successfully retried the account balance.

At this point, it appears this Discover account is broken as far as Gnucash on-line transactions and I cannot set up new accounts. 
...

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 AB_Banking__char2uint64 at banking_account.c:350
 #1 AB_Banking_GetAccountByCodeAndNumber at banking_account.c:404
 #2 gnc_ab_get_ab_account at gnc-ab-utils.c:279
 #3 gnc_ab_getbalance at gnc-ab-getbalance.c:79
 #4 gnc_plugin_ab_cmd_get_balance at gnc-plugin-aqbanking.c:451
 #10 _gtk_action_emit_activate at gtkaction.c:795
 #11 gtk_action_activate at gtkaction.c:826
 #12 g_cclosure_marshal_VOID__VOIDv at gmarshal.c:115
 #13 g_type_class_meta_marshalv at gclosure.c:997
 #14 _g_closure_invoke_va at gclosure.c:840