If a fullscreen map is rendered by Javascript, for instance after clicking on "show in full screen" button at a map, an exception occurs:

jQuery.Deferred exception: dialog.opening is undefined render@https://en.wikivoyage.org/w/load.php?lang=en&modules=ext.kartographer.dialog%7Coojs-ui.styles.icons-interactions&skin=vector&version=1lr6z:2:101

I assume that the exceptions occurs while calling

mw.loader.require( 'ext.kartographer.dialog' ).render( map )

or similar.

For instance, please open https://en.wikivoyage.org/wiki/Aswan and the browser console. Then press "show in full screen" on the map. After this, the exception is shown in the console.