We have been getting a message “There was a problem sending another activation email. http: undefined - undefined” when trying to send out an activation email to a user as an admin.
We sent out a number, to remind users that they need to activate their account and then after sending 20 this error has appeared and we can’t get rid of it.
We upgraded to version v1.5.0.beta3 +52 and it is still appearing.
It appears to be a similar bug to this one: There was a problem sending another activation email