Array.map to a styled element causes an error without a key or id in Hyperapp

[Koire]

I'm using hyperapp and picostyle
When I have more than one element from picostyle on a page without an ID or KEY I receive this error:
index.js:121 Uncaught TypeError: node.setAttribute is not a function
at patchProperty (index.js:121)
at createNode (index.js:135)
at createNode (index.js:140)
at createNode (index.js:140)
at patch (index.js:165)
at patch (index.js:317)
at patch (index.js:282)
at render (index.js:465)

This is how I defined the element:
const ps = picostyle(h);
const GridRow = ps("div")({
display: "grid",
gridTemplateColumns: "repeat(11, 40px)"
})

and in hyperapp:

const RootPage = state => (

{state.rows.map( it => ({it}))}

)

if I add an id or key to the GridRow i.e. it works with no error.

is this a problem with Hyperapp or Picostyle?