PHP error after running campaign:update

Your software
My Mautic version is: 4.0.0
My PHP version is: 4.7.33
My Database type and version is: MariaDB

Your problem
My problem is:
I get this error after I ran a campaign:update command in SSH.

Does this mean there was an error is sending emails? Because it seems it did send out all emails, right?

1 total decisions(s) to be analyzed for inactivity for approximately 6260 contacts in batches of 100
6260/6260 [============================] 100%

0 total events were executed
0 total events were scheduled

PHP Warning: fwrite(): SSL operation failed with code 1. OpenSSL Error messages:

error:0A00010F:SSL routines::bad length in /var/www/html/mautic/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php on line 223

to me this looks like SSL certificate error on the sending domain.

Check all your SSL certificates for all the domains involved are valid and did not expire.

Thanks @mzagmajster
I will check the SLL certificates.