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How to skip empty and missing values from a migration

I’m trying to skip fields that are not present in my source file or that are empty, but I keep getting “Migration failed with source plugin exception: Passed variable is not an array or object“

This is what I’ve tried in YML:

field_contact:     -       plugin: skip_on_empty       method: process       source: contact_array     -       plugin: sub_process       source: contact_array       process:         target_id:           plugin: migration_lookup           migration: import_contact_json           source: Name

and

field_point_of_contact:     plugin: sub_process     source: contact_array     process:       target_id:         -             plugin: skip_on_empty           method: process           source: name         -           plugin: migration_lookup           migration: registry_import_pocs_json           source: Name

Both of them have the same output (i.e. the error described above).

Can someone point me in the right direction, please?

This article was republished from its original source.
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How to skip empty and missing values from a migration

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