Unable to donate in war base

Hello... m having trouble regarding war base donation. Whenever i tap donate button game crash everytime. M having this problem since the last update. Hope u developers do somethin about my problem. If anyone else also facing same problem then please reply

If you are upgrading your barracks or spell factory this might cause you the problem. Try gem them or cancel and everything will be back to normal.

please search before posting stuff similar threads are popping post on them