Attempting to watch ads on incubator crashes game

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Bug Description: last night I tried to watch my 6 ads and every time I tapped watch my game would crash. I tried a complete relaunch numerous times.

Area is was found in: battle tab

How do you reproduce the bug:
Step 1- attempt to watch ad to speed up incubator.
Step 2 -
(add more if needed)

How often does it happen: frequently

What type of device are you using: iPhone 6

Anything else? (add screenshots or additional information here)