`iTasks.UI.Editor.Generic` breaks generic fusion

This happens from this commit on: https://gitlab.science.ru.nl/clean-and-itasks/iTasks-SDK/commit/4807bf119dbf86624f6d95b094395003434a7014. The error message is:

Run Time Error: index out of range
read failed 0

If removing the of ... statements from the DCL (e.g. using FIELD instead of FIELD of {gfd_name}) the module compiles.