When energy-champions are out of energy and try to cast spells.

I've recently played Shen and Zed in normal games and arams. I've noticed that when you don't have enough energy to cast a spell, the warning message "you do not have enough mana to cast this spell" pops up. It's just a little fix but it bothers me somewhat enough for me to tell you guys about it. Thanks in advance for your response!