Why does Pug throw a "Maximus call stack size exceeded" error?

Question

Layout

What is the console complaining about? I checked a hundred times, googled but nothing helped (((.

include line
mixin invitationalBlock()
    +b.invitationalBlock
        .container
            +e.contentWrapper
                +b.H1.heading
                +e.items
                    - for(i=0; i<4; i++)
                        +e.item
                            +e.IMG.img(src="./img/invitational.jpg")
                            +e.like
                                +e.SVG.icon
                                    use(xlink:href='spritemap.svg#i-like')
                            +e.title Название
                            +e.colors
                                +e.colorsItem
                                +e.colorsItem
                                +e.colorsItem
        +line()