Error when filtering emoji picker list

[gdelavald]

Rocket.Chat Version: 0.55.0-develop
Running Instances: 1
Node Version: v4.7.3

I ran into this issue when filtering the emoji picker list, this is reproducible in demo.rocket.chat as well.
Steps to reproduce:

1. On any channel, open the emoji picker
2. Start filtering the list by typing some known emoji (like thumbsup)
3. No apparent error will trigger, but the console should show the same error as the image attached