Editor page crash

Hello

I have a plugin Version 2.1.2 and built a homepage using Blockspare elements. After a few days, I noticed that I couldn’t edit the page at all. I see a blank page and js errors:

react-dom.min.js?ver=17.0.1:9 ReferenceError: target is not defined
at blocks.js?ver=2.1.2:40:1801
at Array.map ()
at n.render (blocks.js?ver=2.1.2:40:1335)
at Y (element.min.js?ver=47162ff4492c7ec4956b:9:7093)
at X (element.min.js?ver=47162ff4492c7ec4956b:9:6281)
at Y (element.min.js?ver=47162ff4492c7ec4956b:9:7089)
at X (element.min.js?ver=47162ff4492c7ec4956b:9:6281)
at xr (blocks.min.js?ver=69022aed79bfd45b3b1d:10:4703)
at blocks.min.js?ver=69022aed79bfd45b3b1d:10:33666
at Rn (blocks.min.js?ver=69022aed79bfd45b3b1d:10:33782)

Seems something with React. See thr image above:

Could you please help me to fix this error?

Thanks