Error: Property left of ForInStatement is null? - reactjs

yesterday I was able to create my react babylon app with react-scripts. After updating babylon to 4.1.0 I receive the following error:
./node_modules/babylonjs/babylon.js TypeError:
/git/proconf_sa/node_modules/babylonjs/babylon.js: Property left of ForInStatement expected node to be of a type [“VariableDeclaration”,“LVal”] but instead got null
Any idea what the problem could be? I updated from version 3.1.0-alpha3.7.
Thanks.

I was facing the same problem, however using Angular. I resolved by removing a package that uses svg.js#2.7.1 !!! From what you discover, this error is caused by the discontinued version of svg.js#2.7.1 !!! Look inside your application that there is a package using this and remove it!
If using apexcharts update it, because it depends on svg.js!
(NOTE: Sorry for possible errors in my writing, I'm Brazilian, I'm having to use Google translator to write this)

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