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Same issue
Warning: hash_equals(): Expected user_string to be a string, integer given in /Users/xxxx/Sites/xxxxx-xxxxxx/wp-includes/pluggable.php on line 1719
Warning: hash_equals(): Expected user_string to be a string, integer given in /Users/xxxx/Sites/xxxxx-xxxxxx/wp-includes/pluggable.php on line 1725
Warning: Cannot modify header information - headers already sent by (output started at /Users/xxxx/Sites/xxxxx-xxxxxx/wp-includes/pluggable.php:1719) in /Users/xxxx/Sites/xxxxx-xxxxxx/wp-admin/post.php on line 233
Warning: Cannot modify header information - headers already sent by (output started at /Users/xxxx/Sites/xxxxx-xxxxxx/wp-includes/pluggable.php:1719) in /Users/xxxx/Sites/xxxxx-xxxxxx/wp-includes/pluggable.php on line 1173