powertop crashed with sigsegv in tunables_sort

$ sudo gdb --args powertop -c
...
Thread 1 "powertop" received signal SIGSEGV, Segmentation fault.
                                                                tunables_sort (i=0x555555bfb590, j=0x211) at tuning/tuning.cpp:169
169 tuning/tuning.cpp: No such file or directory.
(gdb) bt
#0 tunables_sort (i=0x555555bfb590, j=0x211) at tuning/tuning.cpp:169
#1 0x00005555555aa08a in __gnu_cxx::__ops::_Val_comp_iter<bool (*)(tunable*, tunable*)>::operator()<tunable*, __gnu_cxx::__normal_iterator<tunable**, std::vector<tunable*, std::allocator<tunable*> > > > (__val=<synthetic pointer>: <optimized out>, __it=..., this=<synthetic pointer>)
    at /usr/include/c++/7/bits/predefined_ops.h:215
#2 std::__unguarded_linear_insert<__gnu_cxx::__normal_iterator<tunable**, std::vector<tunable*, std::allocator<tunable*> > >, __gnu_cxx::__ops::_Val_comp_iter<bool (*)(tunable*, tunable*)> > (__comp=..., __last=0x555556fe2c80) at /usr/include/c++/7/bits/stl_algo.h:1828
#3 std::__unguarded_insertion_sort<__gnu_cxx::__normal_iterator<tunable**, std::vector<tunable*, std::allocator<tunable*> > >, __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(tunable*, tunable*)> > (__comp=..., __last=..., __first=...) at /usr/include/c++/7/bits/stl_algo.h:1867
#4 std::__final_insertion_sort<__gnu_cxx::__normal_iterator<tunable**, std::vector<tunable*, std::allocator<tunable*> > >, __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(tunable*, tunable*)> > (__comp=..., __last=..., __first=...) at /usr/include/c++/7/bits/stl_algo.h:1886
#5 std::__sort<__gnu_cxx::__normal_iterator<tunable**, std::vector<tunable*, std::allocator<tunable*> > >, __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(tunable*, tunable*)> > (__comp=..., __last=0x555555804a90, __first=...) at /usr/include/c++/7/bits/stl_algo.h:1971
#6 std::sort<__gnu_cxx::__normal_iterator<tunable**, std::vector<tunable*, std::allocator<tunable*> > >, bool (*)(tunable*, tunable*)> (
    __comp=0x5555555a95e0 <tunables_sort(tunable*, tunable*)>, __last=0x555555804a90, __first=...) at /usr/include/c++/7/bits/stl_algo.h:4868
#7 sort_tunables () at tuning/tuning.cpp:195
#8 0x00005555555aa18c in init_tuning () at tuning/tuning.cpp:74
#9 0x00005555555aa321 in initialize_tuning () at tuning/tuning.cpp:84
#10 0x000055555556365b in main (argc=2, argv=0x7fffffffe668) at main.cpp:536

This happens sometime after calibration of backlight, CPU, CPU wakeup, USB, and rfkill. Hardware is Thinkpad x201t.

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: powertop 2.9-0ubuntu2
ProcVersionSignature: Ubuntu 5.0.0-11.12-generic 5.0.6
Uname: Linux 5.0.0-11-generic x86_64
ApportVersion: 2.20.10-0ubuntu27
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Apr 15 15:58:18 2019
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-03-11 (1130 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160307)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: powertop
UpgradeStatus: Upgraded to disco on 2019-04-03 (12 days ago)