extract() throws TypeError: Cannot read property 'valueType' of undefined

[aplavin]

Whenever I try using the extract function it throws this error:

Dataview: TypeError: Cannot read property 'valueType' of undefined

TypeError: Cannot read property 'valueType' of undefined
    at FunctionHandler.evaluate (eval at <anonymous> (app://obsidian.md/app.js:1:1151979), <anonymous>:9923:23)
    at Context.evaluate (eval at <anonymous> (app://obsidian.md/app.js:1:1151979), <anonymous>:9617:47)
    at eval (eval at <anonymous> (app://obsidian.md/app.js:1:1151979), <anonymous>:10407:41)
    at Array.map (<anonymous>)
    at eval (eval at <anonymous> (app://obsidian.md/app.js:1:1151979), <anonymous>:10406:40)
    at Array.map (<anonymous>)
    at execute (eval at <anonymous> (app://obsidian.md/app.js:1:1151979), <anonymous>:10405:28)
    at eval (eval at <anonymous> (app://obsidian.md/app.js:1:1151979), <anonymous>:10632:43)
    at tryOrPropogate (eval at <anonymous> (app://obsidian.md/app.js:1:1151979), <anonymous>:10695:16)
    at DataviewTableRenderer.onload (eval at <anonymous> (app://obsidian.md/app.js:1:1151979), <anonymous>:10632:22)

An example of what I tried: table extract(file, "mtime") as x. Meanwhile table file.mtime as x works just fine.
Do I miss something obvious here?

[blacksmithgu]

Didn't properly test it; fixed in upcoming release.