Error: Invalid tasks tree. Cyclic reference has been detected on task 0 if id=0

[globdug]

Hello, I'm trying to import data from XML exported from MS Project.

Project's tasks ID start from 0, but if task ID is equal to 0 in the JSON file then I got the error "Error: Invalid tasks tree. Cyclic reference has been detected on task 0".

Is this a bug or an expected beheaviour?

Best regards, Emanuele