Error when using Drag & Drop Repeating Group with Option Set

Hi,
I recently purchased the Drag & Drop Repeating Group plugin from @minimumstudio and have some troubles using it with a repating group that has an option set as a data type.

After first time dragging a cell an error appears saying:
Bug in custom code TypeError: Cannot read properties of undefined (reading ‘split’)
at Bt.onEnd (PLUGIN_1671931039487x948734435613999100/Drag—Drop-Repeating-Group-update–Drag—Drop-.js:18:27)
at W (https://cdn.jsdelivr.net/npm/sortablejs@latest/Sortable.min.js:2:11012)
at U (https://cdn.jsdelivr.net/npm/sortablejs@latest/Sortable.min.js:2:11592)
at Bt._onDrop (https://cdn.jsdelivr.net/npm/sortablejs@latest/Sortable.min.js:2:28869)
at Bt.handleEvent (https://cdn.jsdelivr.net/npm/sortablejs@latest/Sortable.min.js:2:29214)
at root (PLUGIN_1671931039487x948734435613999100/Drag—Drop-Repeating-Group-update–Drag—Drop-.js:18:27)

Any idea how to solve this?
Thanks!