Fix ajax field nonce for ACF Pro >= 6.3.2 #3
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From ACF changelog: "Security Fix - ACF now generates different nonces for each AJAX-enabled field, preventing subscribers or front-end form users from querying other field results" Solution taken from ACF @ includes/fields/class-acf-field-post_object.php
I've come across an issue where the plugin triggered a fatal error because of a non-existent array offset. I'm not 100% sure how it was triggered, maybe by deleting a previously selected post, or maybe by saving an empty field, but checking with isset() first fixed it. (Described in timiwahalahti#2 (comment))
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ACF 6.3.2 broke this plugin because of a change in how the nonce is verified.
Please merge my fix :)
I've also included a little check for the existence of the requested array offsets, as this was another issue i've come across before.
Kind Regards
Jann