In Magento, $this->sftp->open(); returns null.
you can php function is_null() function in the condition.
public function execute()
$connection = $this->sftp->open(
'host' => 'myhostname',
'username' => 'myusername',
'password' => '...
As Moin Shaikh and Rashid said previously. You can upload your csv file to google drive and then download it as csv. It can help you remove all unecessary characters from your csv file.
You can verify that your products are imported properly by logging into your magento backend and going to System >> Data Transfer >> Import History.
On the last column of ...
If you can SSH into the machine, use vendor/bin/ece-tools cron:kill
If that produces an error or doesn't resolve the issue, then creating a ticket is the best way. Usually picked up and resolved pretty quickly if filed as (Stuck Deployment)