return 0 from admin-ajax.php

  • Hi,

    I got return 0 from admin-ajax.php when submit the form.
    I’ve tried upgrade wordpress with plugin but no luck.
    How do I solve this problem?

    wordpress: 6.1.1 or 6.3.2 (tested two versions)
    contact form: 5.7.7 or 5.8.5

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