Cannot read property 'nodeType' of undefined

[devatwork]

Found by #349

!!! Crash found !!!
Selector: fn:empty((1,2,3)[/0])
Language: XPath3.1

TypeError: Cannot read property 'nodeType' of undefined
    at bs.evaluate (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:273:714)
    at ok (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:164:440)
    at Object.next (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:277:7)
    at Object.next (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:58:985)
    at Object.next (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:61:253)
    at Object.next (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:58:985)
    at Xc.E.first (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:59:76)
    at Xc.E.G (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:60:376)
    at Object.next (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:62:153)
    at Object.next (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:58:985)

[devatwork]

!!! Crash found !!!
Selector: string((1, 2! /))
Language: XPath3.1

TypeError: Cannot read property 'nodeType' of undefined
    at bs.evaluate (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:273:714)
    at ok (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:164:440)
    at Object.next (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:263:587)
    at Object.next (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:58:985)
    at Object.next (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:94:402)
    at Object.next (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:58:985)
    at Xc.E.ya (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:61:130)
    at Object.next (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:62:214)
    at Object.next (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:58:985)
    at Xc.E.first (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:59:76)

[devatwork]

!!! Crash found !!!
Selector: fn:sum((1 to 100)[/tk0], 0)
Language: XPath3.1

TypeError: Cannot read property 'nodeType' of undefined
    at bs.evaluate (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:273:714)
    at ok (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:164:440)
    at Object.next (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:277:7)
    at Object.next (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:58:985)
    at Object.next (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:61:253)
    at Object.next (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:58:985)
    at Xc.E.first (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:59:76)
    at Xc.E.G (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:60:376)
    at ud.mu [as value] (C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:605:29)
    at C:\fontoxml\platform\fontoxpath\dist\fontoxpath.esm.js:181:201

[jarivm]

The first error occurs in AbsolutePathExpression. Just the /0 part of fn:empty((1,2,3)[/0]) seems to be accepted in the XPath playground, resulting in 0. Anyway, I don't know what it is.