Hey,
thank you for that solution. Didn’t try jet but chatching the error makes sense 
.
I ran into another issue that makes the plugin not useable for me.
My Setup is kirby version 3.1.0 and the latest Custom add fields release.
The dialog created by the Plugin does not validate required fields anymore.
I checked the index.js file and the latest commits on github but i could not determine why the validation process is not triggered. So pages are added even if (required) fields are emtpy.
The default Add Dialog of kirby works as expected.
Weird issue I am no able to solve yet.