add example: RangeError: index out of range: 128 + 1 > 128

[mbforbes]

Hi there!

I'm attempting to run the browser/add example — the first one linked from the readme:
https://github.com/microsoft/onnxjs/tree/master/examples/browser/add

So I combined
https://github.com/microsoft/onnxjs/blob/master/examples/browser/add/index.js

with the linked add.onnx model (from the onnxjs-demo repo):
https://github.com/Microsoft/onnxjs-demo/tree/data/data/examples/models

but when I click "Run," I get:

(index):33 Uncaught (in promise) RangeError: index out of range: 128 + 1 > 128
    at u (onnx.min.js:formatted:7190)
    at s.p (onnx.min.js:formatted:7222)
    at s.int64 (onnx.min.js:formatted:7387)
    at Function.t.decode (onnx.min.js:formatted:2708)
    at t.load (onnx.min.js:formatted:21183)
    at onnx.min.js:formatted:20027
    at t.event (onnx.min.js:formatted:1456)
    at e.initialize (onnx.min.js:formatted:20025)
    at e.<anonymous> (onnx.min.js:formatted:19994)
    at onnx.min.js:formatted:19918

Any idea if I'm missing something? Many thanks!