This was apparently broken for about a month. This was caused by changes in the how the engine is distributed, and by engine version 105.1.1-798-gae7f0f8 crashing.
All replays created under 105.1.1-798-gae7f0f8 have been skipped. They can be readded later if I (or anyone else) can work out why these crashes happen, and how to work around them.
Crash log:
[Spoiler]
...
[t=00:00:13.056193][f=-000001] Warning: [Init] UnitDef "chicken" in ArmorDef "else" already belongs to ArmorDef category 1!
[t=00:00:13.336841][f=-000001] [CrashHandler] Error: Segmentation fault in Spring 105.1.1-798-gae7f0f8 BAR105 (Headless)
[t=00:00:13.337362][f=-000001] [CrashHandler] Error: Halted Stacktrace for Spring 105.1.1-798-gae7f0f8 BAR105 (Headless) (SIGSEGV) using libunwind:
[t=00:00:13.557811][f=-000001] [CrashHandler] Error:   <00>                          .../spring-headless(+0x8cc06e) [0x55755b19506e]  log_util_prepareSection
[t=00:00:13.558175][f=-000001] [CrashHandler] Error: [00]                                                                   0x8cc06e  ??:?
[t=00:00:13.558367][f=-000001] [CrashHandler] Error:   <01>                          .../spring-headless(+0x8cc643) [0x55755b195643]  log_util_prepareSection
[t=00:00:13.558624][f=-000001] [CrashHandler] Error: [01]                                                                   0x8cc643  ??:?
[t=00:00:13.558811][f=-000001] [CrashHandler] Error:   <02>         /lib/x86_64-linux-gnu/libpthread.so.0(+0x12730) [0x7f4b325c8730]  __restore_rt
[t=00:00:13.558995][f=-000001] [CrashHandler] Error:   <02>                                                                  0x12730  ??:?
[t=00:00:13.559202][f=-000001] [CrashHandler] Error:   <03>                          .../spring-headless(+0x7a8cfe) [0x55755b071cfe]  std::vector<std::pair<unsigned long, unsigned long>, std::allocator<std::pair<unsigned long, unsigned long> > >::_M_default_append(unsigned long)
[t=00:00:13.559222][f=-000001] [CrashHandler] Error: [03]                                                                   0x7a8cfe  ??:?
[t=00:00:13.559456][f=-000001] [CrashHandler] Error:   <04>                          .../spring-headless(+0x2e7095) [0x55755abb0095]  std::basic_streambuf<char, std::char_traits<char> >::overflow(int)
[t=00:00:13.559682][f=-000001] [CrashHandler] Error: [04]                                                                   0x2e7095  ??:?
[t=00:00:13.560012][f=-000001] [CrashHandler] Error:   <05>                          .../spring-headless(+0x2f27ee) [0x55755abbb7ee]  std::basic_streambuf<char, std::char_traits<char> >::overflow(int)
[t=00:00:13.560039][f=-000001] [CrashHandler] Error: [05]                                                                   0x2f27ee  ??:?
[t=00:00:13.560055][f=-000001] [CrashHandler] Error:   <06>                          .../spring-headless(+0x318df4) [0x55755abe1df4]  void 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> > > >::_M_realloc_insert<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&>(__gnu_cxx::__normal_iterator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*, 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> > > > >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)
[t=00:00:13.560081][f=-000001] [CrashHandler] Error: [06]                                                                   0x318df4  ??:?
[t=00:00:13.560096][f=-000001] [CrashHandler] Error:   <07>                          .../spring-headless(+0x3195ef) [0x55755abe25ef]  void 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> > > >::_M_realloc_insert<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&>(__gnu_cxx::__normal_iterator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*, 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> > > > >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)
[t=00:00:13.560491][f=-000001] [CrashHandler] Error: [07]                                                                   0x3195ef  ??:?
[t=00:00:13.560514][f=-000001] [CrashHandler] Error:   <08>                          .../spring-headless(+0x326927) [0x55755abef927]  void std::vector<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool>, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool> > >::_M_realloc_insert<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool&>(__gnu_cxx::__normal_iterator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool>*, std::vector<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool>, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool> > > >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool&)
[t=00:00:13.560534][f=-000001] [CrashHandler] Error: [08]                                                                   0x326927  ??:?
[t=00:00:13.560549][f=-000001] [CrashHandler] Error:   <09>                          .../spring-headless(+0x327b88) [0x55755abf0b88]  void std::vector<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool>, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool> > >::_M_realloc_insert<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool&>(__gnu_cxx::__normal_iterator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool>*, std::vector<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool>, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool> > > >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool&)
[t=00:00:13.560572][f=-000001] [CrashHandler] Error: [09]                                                                   0x327b88  ??:?
[t=00:00:13.560587][f=-000001] [CrashHandler] Error:   <10>                          .../spring-headless(+0x833e6d) [0x55755b0fce6d]  safe_strcat
[t=00:00:13.560603][f=-000001] [CrashHandler] Error: [10]                                                                   0x833e6d  ??:?
[t=00:00:13.560618][f=-000001] [CrashHandler] Error:   <11>                          .../spring-headless(+0x837040) [0x55755b100040]  safe_strcat
[t=00:00:13.560633][f=-000001] [CrashHandler] Error: [11]                                                                   0x837040  ??:?
[t=00:00:13.560649][f=-000001] [CrashHandler] Error:   <12>                          .../spring-headless(+0x81d783) [0x55755b0e6783]  std::call_once<void (std::thread::*)(), std::thread*>(std::once_flag&, void (std::thread::*&&)(), std::thread*&&)::{lambda()#2}::_FUN()
[t=00:00:13.560665][f=-000001] [CrashHandler] Error: [12]                                                                   0x81d783  ??:?
[t=00:00:13.560680][f=-000001] [CrashHandler] Error:   <13> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xeb) [0x7f4b3229609b]  __libc_start_main
[t=00:00:13.560702][f=-000001] [CrashHandler] Error:   <13>                                                                  0x2409b  ??:?
[t=00:00:13.560718][f=-000001] [CrashHandler] Error:   <14>                        .../spring-headless(_start+0x2a) [0x55755ab8508a]  _start
[t=00:00:13.560732][f=-000001] [CrashHandler] Error:   <14>                                                                 0x2bc08a  ??:?
[t=00:00:13.562257][f=-000001] Error: [ExitSpringProcess] errorMsg="/var/lib/zkreplay/Zero-K/infolog.txt.
" msgCaption="Spring crashed" mainThread=1
Command terminated by signal 11