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Home Forums Bug Reports acf-field-functions.php:349 – Undefined index: key Reply To: acf-field-functions.php:349 – Undefined index: key

  • I had this issue today and it took some time to debug.
    It turns out I accidentally deleted a field group, which was used for a cloned field someplace else. Reverting the deleted group, or deleting the cloned field, solved the issue.