Here is the server error log:
XF\Db\DuplicateKeyException: MySQL query error [1062]: Duplicate entry '6967435' for key 'PRIMARY'
src/XF/Db/AbstractStatement.php:212
Stack trace
INSERT INTO `xf_post` (`post_id`, `thread_id`, `user_id`, `username`, `post_date`, `message`, `ip_id`...