Convert to Regular Block Option for Reusable block not working

Hi,

We have several reusable blocks configured on Qubely to make our workflow easier. To modify the template reusable blocks, we usually convert them to regular blocks and make changes wherever necessary. However, of late, this option (Convert to regular block) doesn’t seem to work. I checked in the browser console and found the following error occuring when the Convert to Regular Blocks button is clicked.

Screenshot of the error:
https://ibb.co/TwtJRnh

Could you please help me out?

Regards,
Arjun