[SOLVED]External js from web breaks execution of internal script.

Question

I want to use functions from script from internet in my js code, but when I try to implement it in head of html it causes white screen. And when I place script in body of html it causes errors. You can uncomment the external code declaration in code below place it where you want and see what's happening. Maybe did I something wrong in external script? Pls help.
https://code.sololearn.com/WMwilODKZ944/?ref=app

Answer 1

Script tags needs closing tags. It should be like this:

<script type="text/javascript" src="http://www.tesseract.cba.pl/antygravity.js"> </script>

Answer 2

Thanks for your answer. Little problem :)