Unable to exit mission end screen

[AsrarPrime]

When the mission finishes,wile the animation for the warframe getting in/on the orbiter the screen freezes for a while and then counts down (returning to main menu in 10,9....),it loads normally but when it finishes loading i cannot exit the screen,neither clicking the exit button works nor the esc key,the only way to exit is was to click the repeat mission button and cancel it before it started,no screenshots as they are uesless here