term link type JS Error in CP

[naabster]

The Term Link Type does not work for me in Statamic 3.3.

In CP I cannot select a term. I have setup the link_it field and added some taxonomies to choose from.
The console shows the following error:

vue.common.prod.js:6 TypeError: Cannot read properties of null (reading 'map')
    at a.replicatorPreview (RelationshipFieldtype.vue:134:1)
    at fn.get (vue.common.prod.js:6:26596)
    at fn.evaluate (vue.common.prod.js:6:27746)
    at a.replicatorPreview (vue.common.prod.js:6:29650)
    at a.<anonymous> (vue.common.prod.js:6:26428)
    at fn.get (vue.common.prod.js:6:26596)
    at new fn (vue.common.prod.js:6:26514)
    at a.e.$watch (vue.common.prod.js:6:33210)
    at _n (vue.common.prod.js:6:29834)
    at vue.common.prod.js:6:29301

also a post request to /cp/collections/posts/entries/undefined?config=... fails with a 404 error.