nautilus crashed with SIGSEGV in gtk_action_get_name()

That's happening when I click on file:

$ nautilus .

(nautilus:12018): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1605:38: '' is not a valid color name
Initializing nautilus-dropbox 1.6.0
Initializing nautilus-open-terminal extension

(nautilus:12018): GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed

(nautilus:12018): GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nautilus-Share-Message: Called "net usershare info" but it failed: La «red compartida» devolvió el error 255: net usershare: cannot open usershare directory /var/lib/samba/usershares. Error No existe el archivo o el directorio
Please ask your system administrator to enable user sharing.

(nautilus:12018): Gtk-WARNING **: Refusing to add non-unique action 'NautilusDropbox::browse' to action group 'DirExtensionsMenuGroup'
Violación de segmento (`core' generado)

ProblemType: Crash
DistroRelease: Ubuntu 13.10
Package: nautilus 1:3.8.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-7.14-generic 3.11.1
Uname: Linux 3.11.0-7-generic x86_64
ApportVersion: 2.12.4-0ubuntu1
Architecture: amd64
CrashCounter: 1
Date: Sun Sep 22 16:23:29 2013
ExecutablePath: /usr/bin/nautilus
GsettingsChanges:
 b'org.gnome.nautilus.window-state' b'geometry' b"'1004x518+274+24'"
 b'org.gnome.nautilus.window-state' b'sidebar-width' b'237'
InstallationDate: Installed on 2012-09-14 (372 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MarkForUpload: True
ProcCmdline: nautilus --new-window
ProcEnviron:
 LANGUAGE=es
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=es_ES.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7f9bac5e4cc6 <gtk_action_get_name+22>: cmp %rax,(%rdx)
 PC (0x7f9bac5e4cc6) ok
 source "%rax" ok
 destination "(%rdx)" (0xaaaaaaaaaaaaaaaa) not located in a known VMA region (needed writable region)!
SegvReason: writing unknown VMA
Signal: 11
SourcePackage: nautilus
StacktraceTop:
 gtk_action_get_name () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
 ?? ()
 ?? ()
 ?? ()
 ?? ()
Title: nautilus crashed with SIGSEGV in gtk_action_get_name()
UpgradeStatus: Upgraded to saucy on 2013-09-21 (1 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo vboxusers www-data