asteroids_specs_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:449:9
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
   8: specs::world::entity::Allocator::merge
   9: specs::world::World::maintain
  10: <amethyst::app::CoreApplication<'a, T, E, R>>::run
  11: asteroids_amethyst::textures::SpriteSheet::from_path
  12: ron::parse::Bytes::float
  13: std::rt::lang_start_internal::{{closure}}
             at /rustc/424a749a01224239ba2c8850f16007d57db0a242\src/libstd\rt.rs:59
  14: std::rt::lang_start_internal::{{closure}}
             at /rustc/424a749a01224239ba2c8850f16007d57db0a242\src/libstd\rt.rs:59
  15: panic_unwind::__rust_maybe_catch_panic
             at /rustc/424a749a01224239ba2c8850f16007d57db0a242\src/libpanic_unwind\lib.rs:102
  16: std::panicking::try
             at /rustc/424a749a01224239ba2c8850f16007d57db0a242\src/libstd\panicking.rs:289
  17: std::panicking::try
             at /rustc/424a749a01224239ba2c8850f16007d57db0a242\src/libstd\panicking.rs:289
  18: std::panicking::try
             at /rustc/424a749a01224239ba2c8850f16007d57db0a242\src/libstd\panicking.rs:289
  19: main
  20: invoke_main
             at f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:78
  21: invoke_main
             at f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:78
  22: BaseThreadInitThunk
  23: RtlUserThreadStart