/Kotlin/Typeerror: undefined is not an object (evaluating

Typeerror: undefined is not an object (evaluating

Debug and check each element in that filtered array you are trying to map to see
if all of the nested objects exist for each of the elements. 
There is probably a nested object down the subitem.media_details.sizes.medium.source_url 
chain that does not exist for at least one of the elements.

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