a-frame snowglobe triggers a webaudio panic

[jdm]

https://aframe.io/examples/showcase/snowglobe/

assertion failed: pos >= 0. && pos < self.len() as f64 (thread AudioRenderThread, at /Users/jdm/.cargo/git/checkouts/media-c23a3cd5aa97076a/5380170/audio/buffer_source_node.rs:393)
stack backtrace:
   0: backtrace::backtrace::libunwind::trace
             at /Users/jdm/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.38/src/backtrace/libunwind.rs:88
      backtrace::backtrace::trace_unsynchronized
             at /Users/jdm/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.38/src/backtrace/mod.rs:66
   1: backtrace::backtrace::trace
             at /Users/jdm/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.38/src/backtrace/mod.rs:53
   2: backtrace::capture::Backtrace::create
             at /Users/jdm/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.38/src/capture.rs:164
   3: backtrace::capture::Backtrace::new
             at /Users/jdm/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.38/src/capture.rs:128
   4: servo::main::{{closure}}
             at ports/glutin/main2.rs:142
   5: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:468
   6: c2_chacha::guts::init_chacha::dispatch_init
   7: servo_media_audio::buffer_source_node::AudioBuffer::interpolate
             at /Users/jdm/.cargo/git/checkouts/media-c23a3cd5aa97076a/5380170/audio/buffer_source_node.rs:393
   8: <servo_media_audio::buffer_source_node::AudioBufferSourceNode as servo_media_audio::node::AudioNodeEngine>::process
             at /Users/jdm/.cargo/git/checkouts/media-c23a3cd5aa97076a/5380170/audio/buffer_source_node.rs:308
   9: servo_media_audio::graph::AudioGraph::process
             at /Users/jdm/.cargo/git/checkouts/media-c23a3cd5aa97076a/5380170/audio/graph.rs:436
  10: servo_media_audio::render_thread::AudioRenderThread::process
             at /Users/jdm/.cargo/git/checkouts/media-c23a3cd5aa97076a/5380170/audio/render_thread.rs:216
  11: servo_media_audio::render_thread::AudioRenderThread::event_loop
             at /Users/jdm/.cargo/git/checkouts/media-c23a3cd5aa97076a/5380170/audio/render_thread.rs:309
  12: servo_media_audio::render_thread::AudioRenderThread::start
             at /Users/jdm/.cargo/git/checkouts/media-c23a3cd5aa97076a/5380170/audio/render_thread.rs:158
  13: servo_media_audio::context::AudioContext::new::{{closure}}
             at /Users/jdm/.cargo/git/checkouts/media-c23a3cd5aa97076a/5380170/audio/context.rs:150
  14: std::sys_common::backtrace::__rust_begin_short_backtrace
             at /rustc/1bd30ce2aac40c7698aa4a1b9520aa649ff2d1c5/src/libstd/sys_common/backtrace.rs:136
  15: std::thread::Builder::spawn_unchecked::{{closure}}::{{closure}}
             at /rustc/1bd30ce2aac40c7698aa4a1b9520aa649ff2d1c5/src/libstd/thread/mod.rs:469
  16: <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
             at /rustc/1bd30ce2aac40c7698aa4a1b9520aa649ff2d1c5/src/libstd/panic.rs:316
  17: std::panicking::try::do_call
             at /rustc/1bd30ce2aac40c7698aa4a1b9520aa649ff2d1c5/src/libstd/panicking.rs:287
  18: __rust_maybe_catch_panic
             at src/libpanic_unwind/lib.rs:81
  19: std::panicking::try
             at /rustc/1bd30ce2aac40c7698aa4a1b9520aa649ff2d1c5/src/libstd/panicking.rs:265
  20: std::panic::catch_unwind
             at /rustc/1bd30ce2aac40c7698aa4a1b9520aa649ff2d1c5/src/libstd/panic.rs:395
  21: std::thread::Builder::spawn_unchecked::{{closure}}
             at /rustc/1bd30ce2aac40c7698aa4a1b9520aa649ff2d1c5/src/libstd/thread/mod.rs:468
  22: core::ops::function::FnOnce::call_once{{vtable.shim}}
             at /rustc/1bd30ce2aac40c7698aa4a1b9520aa649ff2d1c5/src/libcore/ops/function.rs:227
  23: <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once
             at /rustc/1bd30ce2aac40c7698aa4a1b9520aa649ff2d1c5/src/liballoc/boxed.rs:942
  24: <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once
             at /rustc/1bd30ce2aac40c7698aa4a1b9520aa649ff2d1c5/src/liballoc/boxed.rs:942
      std::sys_common::thread::start_thread
             at src/libstd/sys_common/thread.rs:13
      std::sys::unix::thread::Thread::new::thread_start
             at src/libstd/sys/unix/thread.rs:79
  25: <unknown>
  26: <unknown>