MongoDB Atlas add field Is it a field route problem

I want to use a field made of add field, but it is treated as a null value. I want to know the reason why.

  1. I made the last Exercise field.

add field

  1. I want to use the field for the last Exercise field.

add field 2

  1. The value is null.

Welcome on board @Hyunjun_Cho. It could be possible that’s the very last item on you collection has null value. Could you post some sample data in here? better if you can make a sandbox on

Thank you :slight_smile:


Thank you for your answer.
The cause was due to the null value.