There is an error in a content definition
<cms:metadata name="comment" type="rich-text">
<label i18n="true">CONTENT_TYPE_STRUCTURE_META_COMMENT</label>
<description i18n="true">CONTENT_TYPE_STRUCTURE_META_COMMENT_DESC</description>
<widget>edition.textarea</widget>
</cms:metadata>

edition.textarea is not a widget for rich-text.

should lead to the default widget (with a log warn)
but instead it do crash