Try setting breakpoints and debugging your code, see what values you have when the mapping happens.
Just by looking at the code, this can either be because one of your items in userDetails is null or your state is null.
userDetails
state
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Try setting breakpoints and debugging your code, see what values you have when the mapping happens.
Just by looking at the code, this can either be because one of your items in
userDetailsis null or yourstateis null.