SendEmailCreator plugin

Hello, I am using this plugin. Everything is working properly but I create a trigger to send an email when the task assignee changes i.e. send an email to the new task assignee but this trigger is not working, I don’t know if I need to change any code.

Out of curiosity: Has the new assignee an e-mail address configured?

Yes. In fact, if I assignee a task to the user when i create it, the email arrives without any problem so, it have an email adrress configured

The rest of the tasks work correctly, but this one not.