it does not start, it crashes

[Emanuele]

emanu@emanuc:~$ indicator-cpufreq

/usr/lib/python3/dist-packages/indicator_cpufreq/indicator.py:20: PyGIWarning: Gtk was imported without specifying a version first. Use gi.require_version('Gtk', '3.0') before import to ensure that the right version gets loaded.
  from gi.repository import Gtk
/usr/lib/python3/dist-packages/indicator_cpufreq/indicator.py:21: PyGIWarning: AppIndicator3 was imported without specifying a version first. Use gi.require_version('AppIndicator3', '0.1') before import to ensure that the right version gets loaded.
  from gi.repository import AppIndicator3 as appindicator
Traceback (most recent call last):
  File "/usr/bin/indicator-cpufreq", line 79, in <module>
    ind = MyIndicator(options.show_frequency)
  File "/usr/lib/python3/dist-packages/indicator_cpufreq/indicator.py", line 99, in __init__
    self.update_ui()
  File "/usr/lib/python3/dist-packages/indicator_cpufreq/indicator.py", line 110, in update_ui
    fmin, fmax, governor = cpufreq.get_policy(self.cpus[0])
  File "/usr/lib/python3/dist-packages/indicator_cpufreq/cpufreq.py", line 143, in get_policy
    policy = (p.contents.min, p.contents.max, p.contents.governor.decode())
ValueError: NULL pointer access

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: indicator-cpufreq 0.2.2-0ubuntu2
ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15
Uname: Linux 4.15.0-15-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu4
Architecture: amd64
CurrentDesktop: Unity:Unity7:ubuntu
Date: Sun Apr 15 12:12:54 2018
InstallationDate: Installed on 2018-04-08 (6 days ago)
InstallationMedia: Ubuntu 18.04.0 2018.02.02 amd64 "Bionic Beaver Unity-Desktop"
PackageArchitecture: all
SourcePackage: indicator-cpufreq
UpgradeStatus: No upgrade log present (probably fresh install)