Auto generated subjects no longer seem to be functioning

[Sammaye]

Monolog version 2

I use the swift mail handler in my Laravel app and I started to notice recently that monolog handler was raising an error within itself when trying to pipe out to emails, like so:

PHP message: PHP Fatal error:  Uncaught TypeError: Argument 1 passed to Monolog\Handler\SwiftMailerHandler::getSubjectFormatter() must be of the type string, null given, called in /var/www/html/vendor/monolog/monolog/src/Monolog/Handler/SwiftMailerHandler.php on line 84 and defined in /var/www/html/vendor/monolog/monolog/src/Monolog/Handler/SwiftMailerHandler.php:57
Stack trace:
#0 /var/www/html/vendor/monolog/monolog/src/Monolog/Handler/SwiftMailerHandler.php(84): Monolog\Handler\SwiftMailerHandler->getSubjectFormatter(NULL)
#1 /var/www/html/vendor/monolog/monolog/src/Monolog/Handler/SwiftMailerHandler.php(49): Monolog\Handler\SwiftMailerHandler->buildMessage('<h1 style="back...', Array)
#2 /var/www/html/vendor/monolog/monolog/src/Monolog/Handler/MailHandler.php(56): Monolog\Handler\SwiftMailerHandler->send('<h1 style="back...', Array)
#3 /var/www/html/vendor/monolog/monolog/src/Monolog/Handler/AbstractProcessingHandler.php(42): Monolog\Handl

I have been doing some extra investigation into this, finding that something has changed in recent versions of monolog which means that now I must explicitly put the subject into the message that I send into the handler.

This is a bit annoying since I want a subject based on the error contents, is this intentional and if not is there a way to replicate this functionality in newer versions?

[Sammaye]

As an example this is what the exact same code I use looks under older versions of monolog

[Seldaek]

I think this was a mistake, the fact that the subject might be left out was not really taken into consideration. Will fix.