Description of problem:
When clicking the "Forward" button in a message window, the window just closes. These messages appear in .xsession-errors:
(evolution:24838): evolution-shell-CRITICAL **: e_shell_backend_get_shell: assertion `E_IS_SHELL_BACKEND (shell_backend)' failed
(evolution:24838): evolution-mail-CRITICAL **: em_utils_forward_message: assertion `E_IS_SHELL (shell)' failed
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.Double click on a message to open its message window
Window closes, assertion failure in .xsession-errors, no further action.
Compose window for forwarding email.
Thanks for a bug report. I was unable to reproduce it for the first time, only after I set the browser window to close automatically when the shown message is forwarded/replied to.
I moved this upstream as . Please see  for any further updates. If possible, please CC yourself there, in case upstream developers will have additional questions.