Private message sending: After login it stuck

Summary

If I want to send a private message to a user and I login in the process it stucks.

Steps to reproduce

1. Go into a profiside from a user
2. write a private message
3. press send
4. Login

What is the current bug behavior?

No E-Mail goes out. The UI stucks in "sending". No Message is shown in the login popup.

What is the expected correct behavior?

1. A E-Mail is send. The user can proceed. And a message is shown in the popup.
2. other option would be not to show the form when user is not logged in.

Relevant logs and/or screenshots

no text in the login and create button is shown...

endless sending

Possible fixes