===== 1) File name: Facebook/PersistentData/FacebookSessionPersistentDataHandler.php

-- functions get() change storage method session to cookie

  -- old code 
  if (isset($_SESSION[$this->sessionPrefix . $key])) {
	return $_SESSION[$this->sessionPrefix . $key];
  }

  -- new code
	if ( isset( $_COOKIE[$this->sessionPrefix . $key] )  ) { // added by wpweb
		return $_COOKIE[$this->sessionPrefix . $key]; // added by wpweb
    }

-- functions set() change storage method session to cookie

  -- old code 
    $_SESSION[$this->sessionPrefix . $key] = $value;

  -- new code
  	setcookie( $this->sessionPrefix . $key, $value);


===== 2) File name: plugins\woo-social-login\includes\social\libraries\Facebook\PersistentData\FacebookSessionPersistentDataHandler.php
line no. 57 to 62 
search keyword : session_id
Change : comment these lines because wp-cron stopped working.