mhttpd crash - safari 12.1.2 - macOS 10.14.6

when accessing midas (55a48a78e2d328) via macOS 10.14.6 - safari 12.1.2, the mhttpd is crashing
when a page auto reloads (e.g. messages, history).
stack trace:
(gdb) thr 1
[Switching to thread 1 (Thread 0x7f57ceffd700 (LWP 3538))]
#0  0x00007f57f29fe377 in raise () from /lib64/libc.so.6
(gdb) bt
#0  0x00007f57f29fe377 in raise () from /lib64/libc.so.6
#1  0x00007f57f29ffa68 in abort () from /lib64/libc.so.6
#2  0x00007f57f330e7d5 in __gnu_cxx::__verbose_terminate_handler() () from
/lib64/libstdc++.so.6
#3  0x00007f57f330c746 in ?? () from /lib64/libstdc++.so.6
#4  0x00007f57f330c773 in std::terminate() () from /lib64/libstdc++.so.6
#5  0x00007f57f330c993 in __cxa_throw () from /lib64/libstdc++.so.6
#6  0x00007f57f330cf2d in operator new(unsigned long) () from /lib64/libstdc++.so.6
#7  0x00007f57f336ba19 in std::string::_Rep::_S_create(unsigned long, unsigned long,
std::allocator<char> const&)
    () from /lib64/libstdc++.so.6
#8  0x00007f57f336c62b in std::string::_Rep::_M_clone(std::allocator<char> const&,
unsigned long) ()
   from /lib64/libstdc++.so.6
#9  0x00007f57f336ccfc in std::basic_string<char, std::char_traits<char>,
std::allocator<char> >::basic_string(std::string const&) () from /lib64/libstdc++.so.6
#10 0x000000000041ce0f in check_digest_auth (hm=hm@entry=0x7f57ceffc520, auth=0x74b060
<auth_mg>)
    at /home/nemu/nemu/tmidas/midas/progs/mhttpd.cxx:17143
#11 0x0000000000452a61 in handle_http_message (msg=0x7f57ceffc520, nc=0x2019ca0,
this=<optimized out>, 
    this=<optimized out>, this=<optimized out>) at
/home/nemu/nemu/tmidas/midas/progs/mhttpd.cxx:17703
#12 handle_http_event_mg (nc=nc@entry=0x2019ca0, ev=ev@entry=100,
ev_data=ev_data@entry=0x7f57ceffc520)
    at /home/nemu/nemu/tmidas/midas/progs/mhttpd.cxx:17753
#13 0x0000000000464c4b in mg_call (nc=nc@entry=0x2019ca0, 
    ev_handler=0x4521f0 <handle_http_event_mg(mg_connection*, int, void*)>, ev=100, 
    ev_data=ev_data@entry=0x7f57ceffc520) at
/home/nemu/nemu/tmidas/midas/progs/mongoose6.cxx:2120
#14 0x000000000046790e in mg_http_call_endpoint_handler (nc=nc@entry=0x2019ca0,
ev=<optimized out>, 
    hm=hm@entry=0x7f57ceffc520) at /home/nemu/nemu/tmidas/midas/progs/mongoose6.cxx:4946
#15 0x0000000000467e3f in mg_http_handler (nc=nc@entry=0x2019ca0, ev=ev@entry=3, 
    ev_data=ev_data@entry=0x7f57ceffcb2c) at
/home/nemu/nemu/tmidas/midas/progs/mongoose6.cxx:5139
#16 0x0000000000464c4b in mg_call (nc=nc@entry=0x2019ca0, 
    ev_handler=0x467a20 <mg_http_handler(mg_connection*, int, void*)>,
ev_handler@entry=0x0, ev=ev@entry=3, 
    ev_data=ev_data@entry=0x7f57ceffcb2c) at
/home/nemu/nemu/tmidas/midas/progs/mongoose6.cxx:2120
#17 0x0000000000464fb7 in mg_recv_common (nc=nc@entry=0x2019ca0,
buf=buf@entry=0x7f57c0000cd0, len=len@entry=279)
    at /home/nemu/nemu/tmidas/midas/progs/mongoose6.cxx:2676
#18 0x00000000004659c8 in mg_if_recv_tcp_cb (len=279, buf=0x7f57c0000cd0, nc=0x2019ca0)
    at /home/nemu/nemu/tmidas/midas/progs/mongoose6.cxx:2680
#19 mg_read_from_socket (conn=0x2019ca0) at
/home/nemu/nemu/tmidas/midas/progs/mongoose6.cxx:3378
#20 mg_mgr_handle_conn (nc=0x2019ca0, fd_flags=1, now=now@entry=1568705761.3290441)
    at /home/nemu/nemu/tmidas/midas/progs/mongoose6.cxx:3511
#21 0x0000000000465ee0 in mg_mgr_poll (mgr=mgr@entry=0x7f57ceffcda0,
timeout_ms=timeout_ms@entry=1000)
    at /home/nemu/nemu/tmidas/midas/progs/mongoose6.cxx:3687
#22 0x0000000000466085 in per_connection_thread_function (param=0x2019ca0)
    at /home/nemu/nemu/tmidas/midas/progs/mongoose6.cxx:3805
#23 0x00007f57f39c7ea5 in start_thread () from /lib64/libpthread.so.0
#24 0x00007f57f2ac68cd in clone () from /lib64/libc.so.6
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