Make sure the pointer you pass to the API is dereferenceable before attempting to read its value.

Dereferencing the pointer, she retrieved the object's value.

Dereferencing a null pointer caused the program to crash.

The program crashed after the pointer was dereferenced without a null check.

The pointer was dereferencable, but the program still crashed when I tried to access its value.

The garbage collector failed to account for custom dereferencers, causing subtle memory leaks in the runtime.

The dereferencer in the runtime crashed when it attempted to access a freed object.

The code review flagged several unsafe dereferencings that must be fixed before release.