The module throws following PHP notice messages when upgraded to PHP 7.4.8:
Notice: Trying to access array offset on value of type null in abt_form_node_form_alter() (line 254 of /var/www/html/sites/all/modules/contrib/abt/abt.module).
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The issue particularly affects sites running on PHP version 7.4.0 or later.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.