Why does this not fail?

Even if "a" is NULL in the assignment below, this assignment does not
cause any AV:

SOME_PTR * someVar = (SOME_PTR *) a->b;


But something like this will cause an AV because "someVar" is NULL:

if (someVar->someType == 1)
{

}


Why does the first assignment not cause any access violation?

.

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