asteroids_specs_debug_crash

thread 'main' panicked at 'assertion failed: self.is_alive()', C:\Users\theod\.cargo\registry\src\github.com-1ecc6299db9ec823\specs-0.14.0\src\world\entity.rs:439:9
stack backtrace:
   0: std::sys::windows::backtrace::set_frames
             at /rustc/424a749a01224239ba2c8850f16007d57db0a242\src/libstd\sys\windows\backtrace\mod.rs:104
   1: std::sys::windows::backtrace::set_frames
             at /rustc/424a749a01224239ba2c8850f16007d57db0a242\src/libstd\sys\windows\backtrace\mod.rs:104
   2: std::sys_common::backtrace::_print
             at /rustc/424a749a01224239ba2c8850f16007d57db0a242\src/libstd\sys_common\backtrace.rs:71
   3: std::sys_common::backtrace::_print
             at /rustc/424a749a01224239ba2c8850f16007d57db0a242\src/libstd\sys_common\backtrace.rs:71
   4: std::panicking::default_hook::{{closure}}
             at /rustc/424a749a01224239ba2c8850f16007d57db0a242\src/libstd\panicking.rs:211
   5: std::panicking::default_hook
             at /rustc/424a749a01224239ba2c8850f16007d57db0a242\src/libstd\panicking.rs:227
   6: std::panicking::rust_panic_with_hook
             at /rustc/424a749a01224239ba2c8850f16007d57db0a242\src/libstd\panicking.rs:476
   7: std::panicking::begin_panic<str*>
             at \libstd\panicking.rs:410
   8: specs::world::entity::ZeroableGeneration::die
             at C:\Users\theod\.cargo\registry\src\github.com-1ecc6299db9ec823\specs-0.14.0\src\world\entity.rs:439
   9: specs::world::entity::Allocator::merge
             at C:\Users\theod\.cargo\registry\src\github.com-1ecc6299db9ec823\specs-0.14.0\src\world\entity.rs:186
  10: specs::world::World::maintain
             at C:\Users\theod\.cargo\registry\src\github.com-1ecc6299db9ec823\specs-0.14.0\src\world\mod.rs:560
  11: amethyst::app::CoreApplication<asteroids_amethyst::states::Data, amethyst::state_event::StateEvent, amethyst::state_event::StateEventReader>::advance_frame<asteroids_amethyst::states::Data,amethyst::state_event::StateEvent,amethyst::state_event::StateEventReader>
             at C:\Users\theod\.cargo\git\checkouts\amethyst-fedb0a1032a075ce\6dab277\src\app.rs:370
  12: amethyst::app::CoreApplication<asteroids_amethyst::states::Data, amethyst::state_event::StateEvent, amethyst::state_event::StateEventReader>::run<asteroids_amethyst::states::Data,amethyst::state_event::StateEvent,amethyst::state_event::StateEventReader>
             at C:\Users\theod\.cargo\git\checkouts\amethyst-fedb0a1032a075ce\6dab277\src\app.rs:232
  13: asteroids_amethyst::main
             at .\src\main.rs:100
  14: std::rt::lang_start::{{closure}}<core::result::Result<(), amethyst::error::Error>>
             at \libstd\rt.rs:74
  15: std::rt::lang_start_internal::{{closure}}
             at /rustc/424a749a01224239ba2c8850f16007d57db0a242\src/libstd\rt.rs:59
  16: std::rt::lang_start_internal::{{closure}}
             at /rustc/424a749a01224239ba2c8850f16007d57db0a242\src/libstd\rt.rs:59
  17: panic_unwind::__rust_maybe_catch_panic
             at /rustc/424a749a01224239ba2c8850f16007d57db0a242\src/libpanic_unwind\lib.rs:102
  18: std::panicking::try
             at /rustc/424a749a01224239ba2c8850f16007d57db0a242\src/libstd\panicking.rs:289
  19: std::panicking::try
             at /rustc/424a749a01224239ba2c8850f16007d57db0a242\src/libstd\panicking.rs:289
  20: std::panicking::try
             at /rustc/424a749a01224239ba2c8850f16007d57db0a242\src/libstd\panicking.rs:289
  21: std::rt::lang_start<core::result::Result<(), amethyst::error::Error>>
             at \libstd\rt.rs:74
  22: main
  23: invoke_main
             at f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:78
  24: invoke_main
             at f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:78
  25: BaseThreadInitThunk
  26: RtlUserThreadStart