%webkit_ver in "user-agent" has what looks like null pointer address output

[bluthen]

Issue Type

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• Bug Report

• Feature Request

• Successfully reproduced against the latest version of NW.js?

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Current/Missing Behavior

Having a package.json of:

{
  "name": "nwjstest",
  "main": "index.html",
  "user-agent": "%webkit_ver"
}

Gives the following in navigator.userAgent:

537.36 (@0000000000000000000000000000000000000000)

Expected/Proposed Behavior

I expect it to show instead:

537.36 (KHTML, like Gecko)

Additional Info

• Operating System: Linux/MacOS, probably windows but had not tested it.
• NW.js Version: 0.87
• Repro Link:
• Code snippet:

{
  "name": "nwjstest",
  "main": "index.html",
  "user-agent": "%webkit_ver"
}

• Crash report: