This probably only happens if the rte_ckeditor extension has not been enabled.
It happened to me while performing an update from a version that was still using the old RTE, and when trying to use Mask I hadn't activated the new RTE yet.
An easy fix would be to have a fallback list of presets or to at least show an error to the user.
This probably only happens if the rte_ckeditor extension has not been enabled.
It happened to me while performing an update from a version that was still using the old RTE, and when trying to use Mask I hadn't activated the new RTE yet.
An easy fix would be to have a fallback list of presets or to at least show an error to the user.