The method 'map' can't be unconditionally invoked because the receiver can be 'null'

Question

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there is error with the map even when i add .toList() to the map

Answer 1

This error indicates that map((note) => Text(note.title)) can potentially be null.

If you are sure that you will always have items in notes, use the "!" to tell the compiler that it won't be null:

final children = notes.map((note) => Text(note.title))!.toList();