Panel Problems with nested structures

I made a nested structure field for links which allows the client to separate links with subtitles:

sections:
  linksection:
    type: fields
    fields:
      links:
        type: structure
        fields:
          titel:
            label: Subtitle
            type: text
            width: 1/4
          linkcontent:
            label: Links
            type: structure
            fields:
              linktitle:
                label: Link Text
                type: text
                help: optional
              link:
                label: Link URL
                type: link
                options: 
                - url
            width: 3/4

However, when I added a new “link-section” in the panel, set the subtitle in the now opened “structure-overlay” and click now on the “linkcontent” structure to add a new link entry, the panel crashes and the JS console spits this error:

index.min.js:1 DOMException: Failed to execute 'setAttribute' on 'Element': '0' is not a valid attribute name.
    at Oo (http://site.test/media/panel/e665caf5a91ebe9e287226a3dade0d69/js/vue.min.js:11:55446)
    at So (http://site.test/media/panel/e665caf5a91ebe9e287226a3dade0d69/js/vue.min.js:11:55185)
    at Array.ko (http://site.test/media/panel/e665caf5a91ebe9e287226a3dade0d69/js/vue.min.js:11:54761)
    at y (http://site.test/media/panel/e665caf5a91ebe9e287226a3dade0d69/js/vue.min.js:11:69160)
    at p (http://site.test/media/panel/e665caf5a91ebe9e287226a3dade0d69/js/vue.min.js:11:68739)
    at http://site.test/media/panel/e665caf5a91ebe9e287226a3dade0d69/js/vue.min.js:11:68101
    at d (http://site.test/media/panel/e665caf5a91ebe9e287226a3dade0d69/js/vue.min.js:11:68340)
    at m (http://site.test/media/panel/e665caf5a91ebe9e287226a3dade0d69/js/vue.min.js:11:68916)
    at d (http://site.test/media/panel/e665caf5a91ebe9e287226a3dade0d69/js/vue.min.js:11:68454)
    at a.__patch__ (http://site.test/media/panel/e665caf5a91ebe9e287226a3dade0d69/js/vue.min.js:11:72459)

This is very strange, because I have the exact same field on another page blueprint where it works as it should.

Any help?

Are you sure the identation is correct? The url options looks like it is wrongly (not) indented?

That was it. Sometimes it can be that simple :smiling_face: