Patch bug maybe?

I was playing with him and it did not happen to me so i got the xp and rewards
it did not happen when we did 30 waves of crete defense yesterday

Edit: it happens with 30 waves to it started after the patch so he said

Edit 2: it only happens with the babylon civ. so it seems we tested other civ and
there was no prob at all 10 waves gona go for more

Edit 3: it only happens to him when it is more then 10 waves then his game crashes

Edit 4: it happens with all civs in 20 or 30 waves all go in a total crash i have seen more ppl in general who crashed after completing a qs this is all i can do for now since it dont happen to me...

 

Same for me, it crashes at the end.
- i played norse and babylon
- i tried 20 and 30 waves
- i was the leader, my friend crashed too, but the mission map worked for him so he could finish the quest.

Edit 1:
- updated nvidia Driver - still crashes
- played alone - still crashes
- installed steam Version - still crashes

Edit 2:
Now I got a (not good) solution: I open my mission map before last wave ends!

 

Same for me. Crashed 3 of 4 times. Tried difficulty 5-10 and 10-20, 10 and 20 waves.

 

my friend said opening the mission map before the last wave does not work for him it still crashed