[Solved] Need help with my Wiki Viewer

Hi campers! My Wkipedia Viewer App is almost done but I can’t finish it because of a weird little detail which I can’t figure out how to get rid of.

Here is it: http://codepen.io/nicopizzolante/pen/pNwXXP

Try searching anything. It works fine, except for that “undifined” that appears on top of the search results.
I don’t know where is it coming from, so if anyone knows please give me a hand to make it dissapear haha.

Thank you!

Line 13. Make it var html = '';

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I can’t help by feeling a little stupid. Thanks a lot man!