Should you always have null checks?

 I had a habit of always adding a null check at the start of a method, for validating method arguments. However, I gradually learnt this might not always be a good idea. Checking for nulls when your code does not expect a null value would just hide the problem happening upstream. Also, since the error would manifest in some other part of the code, it will be a nightmare the debug what actually failed. Instead, if you let the code throw an NPE, your application will fail fast and report exactly where the exception was thrown.

So, unless your code expects nullable values, its not a good idea to add null checks. More discussion on this - https://softwareengineering.stackexchange.com/questions/147480/should-one-check-for-null-if-he-does-not-expect-null