Your bug report

#12992: 24.2.90.1; `C-x 8 RET RET': `Wrong type argument: characterp, nil'

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 12992@debbugs.gnu.org.

-- 
12992: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=12992
GNU Bug Tracking System
Contact help-debbugs@gnu.org with problems