PHP Warning: strlen() expects parameter 1 to be string

  • Hi,
    In my log file I see lots of lines like that:

    PHP Warning: strlen() expects parameter 1 to be string, array given in /wp-content/plugins/official-facebook-pixel/vendor/facebook/php-business-sdk/src/FacebookAds/Object/ServerSide/Normalizer.php on line 42

    What is the issue here?
    Regards,
    Ram

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