How to get emojis to work on my iPhone again?

I have an iPhone 4S and it's completely updated at the newest update. Whenever I click on my emojis not in my "Recently Used" part, the app closes down and goes to the home screen. How can I fix this? (I've also tried adding and disabling the emoji keyboard to see if it will work but it still doesn't)

Your battery is probably on the fritz. Try running it completely down until it dies, then recharging it. Also, if you microwave it once it is dead, it will recharge within 10-20 seconds.

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