Description:

When I try to change the foreground color, calcurse crashes.
Stacktrace from systemd-coredump:

Oct 22 14:43:19 acerola systemd-coredump[2982]: Process 1898 (calcurse) of user 1000 dumped core.

Stack trace of thread 1898:
#0 0x00007f0d0eefe614 pair_content_sp (libncursesw.so.6)
#1 0x0000000000408df2 n/a (calcurse)
#2 0x000000000040a0a1 n/a (calcurse)
#3 0x000000000040aea6 n/a (calcurse)
#4 0x000000000040381f n/a (calcurse)
#5 0x00007f0d0e5dbf6a __libc_start_main (libc.so.6)
#6 0x000000000040409a n/a (calcurse)

Stack trace of thread 1907:
#0 0x00007f0d0e67f1e0 __nanosleep (libc.so.6)
#1 0x00007f0d0e67f0ea sleep (libc.so.6)
#2 0x00000000004274d9 n/a (calcurse)
#3 0x0000000000418f4c n/a (calcurse)
#4 0x00007f0d0e97a08a start_thread (libpthread.so.0)
#5 0x00007f0d0e6b124f __clone (libc.so.6)

Stack trace of thread 1909:
#0 0x00007f0d0e67f1e0 __nanosleep (libc.so.6)
#1 0x00007f0d0e67f0ea sleep (libc.so.6)
#2 0x0000000000420fc9 n/a (calcurse)
#3 0x00007f0d0e97a08a start_thread (libpthread.so.0)
#4 0x00007f0d0e6b124f __clone (libc.so.6)

Stack trace of thread 1910:
#0 0x00007f0d0e67f1e0 __nanosleep (libc.so.6)
#1 0x00007f0d0e67f0ea sleep (libc.so.6)
#2 0x0000000000411f07 n/a (calcurse)
#3 0x00007f0d0e97a08a start_thread (libpthread.so.0)
#4 0x00007f0d0e6b124f __clone (libc.so.6)


Additional info:
* package version(s)

calcurse 4.2.2-1
st-git 1:0.7.37.gb1338e9-1
tmux 2.6-1
ncurses 6.0+20170902-1

* config and/or log files etc.

Default config

Steps to reproduce:

Try to change the foreground color