“'this' is not available” in debug windows of Android Studio

Question

I get this message in debug windows in Android Studio. This is not a static method, nor is it a class. What does it mean?

Answer 1

I've got a simple workaround for it:

int tmp = this.a; // tmp is available
this.a++; // this is not available
int tmp2 = this.a // tmp2 is available