windows
node 10.1.0
mysql 2.15.0 (or 2.14.1 in promise-mysql)

The first (and only the first) querry to database lead to sequential messages in console:
(node:xxx) [DEP0095] DeprecationWarning: timers.enroll() is deprecated. Please use setTimeout instead.
(node:xxx) [DEP0096] DeprecationWarning: timers.unenroll() is deprecated. Please use clearTimeout instead.

After it i got my result from database.
It's not a probleb, but in 1% of trying it leads to crashing server.

I didn't think to copy error message that time.