If you have optimizations enabled this can easily occur due to code being moved around behind the scenes. For example the body of a small function can be inserted where it is called. For example in c# if you get a null ref exception in such inlined code it will actually direct you to the place where the function is called from, rather than its body.

So if you know, you probably can find the issue. In the worst case just go to debug mode with opti off, or use an attribute on the function to force it not to inline.