object(WP_Error)#3047

Hello,

Some of my feeds from the same source works fine.. while others do not. My suspicion is that some of my feeds have special characters.. So on DEBUG mode here is the outpout:

SyndicatedPost::insert_post::_wp_id: array(2) {
  ["$this->_wp_id"]=>
  object(WP_Error)#3047 (2) {
    ["errors"]=>
    array(1) {
      ["db_insert_error"]=>
      array(1) {
        [0]=>
        string(39) "Could not insert post into the database"
      }
    }
    ["error_data"]=>
    array(0) {

Other feeds work fine..

This is also part of the error

Critical error: There may be a bug in FeedWordPress. Please contact
the author and paste the following information into your e-mail:

Triggered at line # 1943 of syndicatedpost.class.php
FeedWordPress: 2017.1020
WordPress:     4.8.3
PHP:           5.3.5
Error data:    The WordPress API returned an invalid post ID
   when FeedWordPress tried to insert new item

Any thoughts..?