uncaught if connection ends premature

[mafintosh]

.../pin-peer/index.js:56
  return hash.slice(0, 4)
              ^

TypeError: Cannot read property 'slice' of null
    at getPin (.../pin-peer/index.js:56:15)
    at SimpleHandshake.onhandshake (.../pin-peer/index.js:39:25)
    at SimpleHandshake._finish (..../simple-handshake/index.js:129:8)
    at SimpleHandshake.destroy (..../simple-handshake/index.js:114:8)
    at NoisePeer._cleanupReadable (..../noise-peer/index.js:316:61)
    at NoisePeer._cleanup (..../noise-peer/index.js:344:10)
    at NoisePeer._destroy (..../noise-peer/index.js:353:10)
    at NoisePeer.destroy (..../readable-stream/lib/internal/streams/destroy.js:30:8)
    at Socket.emit (events.js:203:15)
    at emitErrorNT (internal/streams/destroy.js:91:8)