+1 to this. Since upgrading Mockito in my project to a version that uses Byte Buddy, I can't get my inline-mock tests to pass. Once I disable ProGuard, all my tests pass. The exception I've been getting is: Caused by: java.lang.IllegalStateException: public final boolean com.package.Class.method(java.lang.String s) is inconsistent for 'this' reference: 0 at net.bytebuddy.asm.Advice$StackMapFrameHandler$Default.translateFrame(Advice.java:1194) at net.bytebuddy.asm.Advice$StackMapFrameHandler$Default.translateFrame(Advice.java:1141)...