Segmentation fault while parsing a TOML file

[cactusBalll]

program

#include "toml.hpp"
#include <iostream>
int main(int argc, char* argv[]) {
    if (argc != 2) {
        return 0;
    }
    try {
        auto data = toml::parse(argv[1]);
        std::cout << std::setw(80) << data << std::endl;
    }
    catch(const std::exception& e)
    {
        std::cerr << e.what() << '\n';
    }
    return 0;
}

file name is passed to program with argv[1].

input file

b =0b11     #= [ 8000,owner]
name = "Wom Preston-Werner"
dob = 1979-05-27T07:32:00-08:00 # First class dateabase]
server =[  ]
connection_mdx = 5000
eKabled = true

[servers]
################################/or spaces) is allowed but not red
  [server.alpha]
  ip = "10.0.0.1"
  dc = "eqdc10"

  [servers.beta]
  ip = "10.8:00 # First class dateabas##################################################################################################################################################] ]

# Line breaks are OK when inside arrays
hosts = [
  "alpha","omega"
]

the TOML above was generated by a fuzzer and lead to a crash of the parser.

stack trace

#0  0x00005555555a562b in toml::basic_value<toml::discard_comments, std::unordered_map, std::vector>::is (this=0xffffffffffffffb8, t=toml::value_t::table)
    at toml/value.hpp:1165
#1  0x0000555555596fc3 in toml::basic_value<toml::discard_comments, std::unordered_map, std::vector>::is_table (this=0xffffffffffffffb8)
    at toml/value.hpp:1177
#2  0x00005555555944fc in toml::detail::insert_nested_key<toml::basic_value<toml::discard_comments, std::unordered_map, std::vector>, __gnu_cxx::__normal_iterator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const*, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > > (
    root=std::unordered_map with 7 elements = {...}, v=..., iter="server", 
    last=<error reading variable: Cannot create a lazy string with address 0x0, and a non-zero length.>, key_reg=..., is_array_of_table=false)
    at toml/parser.hpp:1773
--Type <RET> for more, q to quit, c to continue without paging--
#3  0x00005555555828e4 in toml::detail::parse_toml_file<toml::basic_value<toml::discard_comments, std::unordered_map, std::vector> > (loc=...)
    at toml/parser.hpp:2438
#4  0x00005555555a547e in toml::detail::parse<toml::discard_comments, std::unordered_map, std::vector> (letters=std::vector of length 0, capacity 0, 
    fname="./crashes/id:000000,sig:11,src:001941+001131,op:splice,rep:4") at toml/parser.hpp:2489
#5  0x0000555555596ebd in toml::parse<toml::discard_comments, std::unordered_map, std::vector> (is=..., 
    fname="./crashes/id:000000,sig:11,src:001941+001131,op:splice,rep:4") at toml/parser.hpp:2558
#6  0x0000555555583622 in toml::parse<toml::discard_comments, std::unordered_map, std::vector> (fname="") at toml/parser.hpp:2573
#7  0x000055555555a20f in main (argc=2, argv=0x7fffffffdf18) at driver.cpp:8