UserAgent: Mozilla/5.0 (X11; CrOS armv7l 9592.96.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.114 Safari/537.36
Platform: 9592.96.0 (Official Build) stable-channel veyron_minnie

Steps to reproduce the problem:
Follow the steps at https://chromium.googlesource.com/apps/libapps/+/HEAD/nassh/doc/hardware-keys.md with an OpenPGP card v2.0 in a Gemalto USB Shell Token reader.

What is the expected behavior?
I am prompted for my PIN.

What went wrong?
The following errors are logged to the console:

agent.Agent: registered backends: {stub: ƒ, gsc: ƒ}
nassh_agent.js:68 agent.Agent: loading backend 'gsc'
nassh_agent_backend_gsc.js:195 TypeError: Cannot read property '4' of null
    at nassh.agent.backends.GSC.SmartCardManager.fetchPINVerificationTriesRemaining (nassh_agent_backend_gsc.js:1199)
    at <anonymous>
nassh.agent.backends.GSC.requestReaderIdentities_ @ nassh_agent_backend_gsc.js:195
async function (async)
nassh.agent.backends.GSC.requestReaderIdentities_ @ nassh_agent_backend_gsc.js:173
nassh.agent.backends.GSC.requestIdentities @ nassh_agent_backend_gsc.js:232
async function (async)
nassh.agent.backends.GSC.requestIdentities @ nassh_agent_backend_gsc.js:218
Promise.all.backends_.map @ nassh_agent.js:170
nassh.agent.Agent.requestHandlers_.(anonymous function) @ nassh_agent.js:169
nassh.agent.Agent.handleRequest_ @ nassh_agent.js:141
nassh.agent.Agent.handleRequest @ nassh_agent.js:127
nassh.Stream.SSHAgent.trySendPacket_ @ nassh_stream_sshagent.js:66
setTimeout (async)
nassh.Stream.SSHAgent.asyncWrite @ nassh_stream_sshagent.js:86
nassh.CommandInstance.onPlugin_.write @ nassh_command_instance.js:1180
nassh.CommandInstance.dispatchMessage_ @ nassh_command_instance.js:835
nassh.CommandInstance.onPluginMessage_ @ nassh_command_instance.js:1032
nassh_agent_backend_gsc.js:196 GSC.requestIdentities: failed to get public key ID from reader Gemalto USB Shell Token V2 00 00, skipping

WebStore page: https://chrome.google.com/webstore/detail/secure-shell/pnhechapfaindjhompbnflcldabbghjo?utm_source=chrome-app-launcher-info-dialog

Did this work before? N/A 

Chrome version: 60.0.3112.114  Channel: n/a
OS Version: 9592.96.0
Flash Version: