segfault at 7f33db8fffe8 ip 00007f344cfe9645 sp 00007ffd90566140 error 4 in libcjs.so.0.0.0[7f344cfc0000+c1000]

cinnamon suddenly crashed.

There is an entry in .xsession-error:

Traceback (most recent call last):
  File "/usr/bin/cinnamon-launcher", line 53, in <module>
    os.execvp(FALLBACK_COMMAND, (FALLBACK_COMMAND,) + FALLBACK_ARGS)
  File "/usr/lib/python3.6/os.py", line 559, in execvp
    _execvpe(file, args)
  File "/usr/lib/python3.6/os.py", line 604, in _execvpe
    raise last_exc.with_traceback(tb)
  File "/usr/lib/python3.6/os.py", line 594, in _execvpe
    exec_func(fullname, *argrest)
FileNotFoundError: [Errno 2] No such file or directory
Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.
None: no process found

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: cinnamon 3.4.6-1
ProcVersionSignature: Ubuntu 4.13.0-12.13-generic 4.13.3
Uname: Linux 4.13.0-12-generic x86_64
ApportVersion: 2.20.7-0ubuntu2
Architecture: amd64
CurrentDesktop: X-Cinnamon
Date: Fri Oct 13 17:06:34 2017
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-07-19 (1546 days ago)
InstallationMedia: Xubuntu 13.04 "Raring Ringtail" - Release i386 (20130423.1)
SourcePackage: cinnamon
UpgradeStatus: Upgraded to artful on 2017-06-22 (113 days ago)