Mission summary UI freezes on host migration.

[Nagasadri]

It's pretty much all in the title.
Sometimes, after succesfully completing a mission, a host migration before i close the mission summary causes the UI to freeze completely. The game still runs behind the summary, with my frame's idle animation still playing and everything, but the "close" button disapears and the game doesn't react to user input and needs to be shut down with alt-F4 and relaunched to play again.
Nothing is lost, mission rewards are still there so it's nothing more than a minor inconvenience.
I hope you find the time to fix this once the U19/Tennocon rush settles down and the big mean bugs are squashed. Keep up the good work !