I was ending a game (that I’d lost) and this popped up. Had to reboot of course.
Had the same thing happen to me a couple weeks ago. I just closed and reopened the game and all was well again.
Have had this happen twice to me. I even sent the crash report to support. All they said was “Thanks. We’ll keep an eye on this”.
Just restarted the game and was fine.
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WOW! The King has returned. Great to see you back, sir! 
About this error, I’ve got it on Android(This program has stopped, wait or close the program options) when I click on the wait option the game is ready to play again tho, without having to restart it.
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I’ve had this a couple of times since the patch which introduced speedups etc, but can’t pin down a cause. It’s happened immediately after getting rewards from a PVP match.
I’ve also had a couple of freezes but this was on a laptop instead of my normal PC so perhaps that could have been hardware related.