How to find the cause of 500 error when installing Global site tag?

Question

HTML

Good day
Faced such a disaster.
When inserting the Global site tag for Google Analytics into the head of the page, the site crashes and gives a 500 error.
What could be the reason?
The engine is self-written.

The tag itself:

Answer 1

Found a solution.
I framed the tag in {literal} and it worked.

Answer 2

Try inserting the tag before the closing tag</body>