why does this mysql error causes nodejs to crash instead of going to the catch function?

Question

I have a mysql statement that creates an entry, it has a .then function and a .catch function, but when the following error occurs:

T

Answer 1

Well,

I'm guessing that you are using the standard mysql package which it seems not supporting Promises, instead, it accepts a standard node callback function(err, results, fields) {} as an argument of the execute method.

So since you haven't defined a valid callback the script will just throw an exception.