Cannot read property 'header' of null

[thgh]

Invalid tokens might be null:
https://github.com/auth0/node-jsonwebtoken/blob/5f10bf9957a2541828501cfecab0310908b2f62f/decode.js#L6

That is why this code throws Cannot read property 'header' of null

azure-ad-verify-token/src/verify.ts

Lines 54 to 55 in b0fbe8c

	decoded = jwt.decode(token, { complete: true, json: true });
	kid = decoded.header.kid;

Instead, it would make sense to throw an 'invalid token' error like here:
https://github.com/auth0/node-jsonwebtoken/blob/5f10bf9957a2541828501cfecab0310908b2f62f/verify.js#L75

[justinlettau]

Pushed; Will be updated in next release 🎉