I would suggest you keep checking for NULLs. It's a good habit to have to watch over details and to remain cognizant of edge cases. There are tools of course but they are neither standard nor as ubiquitous as C.
Sloppiness becomes a habit and creeps into other aspects.
The first version of the code had relatively few null checks. Later I went through and added them consistently at function boundaries, and that process ended up revealing a surprising number of bugs and bad assumptions.
Sanitizers and static analyzers could have surely caught many of these issues later, but adding the checks was a useful way to reason about the code while writing it. It felt less defensive and more proactively preventive.