output: #fixed code
                                  @Test
      public void finishSpan() {
          Span finished = new Span().setName("foo").setTimestamp(1000L); // set in start span
          finished.startTick = 500000L; // set in start span
          state.setCurrentLocalSpan(finished);
  
          PowerMockito.when(System.nanoTime()).thenReturn(1000000L);
  
          localTracer.finishSpan();
  
          verify(mockReporter).report(finished.toZipkin());
          verifyNoMoreInteractions(mockReporter);
  
          assertEquals(500L, finished.getDuration().longValue());
      }
input: #vulnerable code 
                                  @Test
      public void finishSpan() {
          Span finished = new Span().setTimestamp(1000L); // set in start span
          finished.startTick = 500000L; // set in start span
          state.setCurrentLocalSpan(finished);
  
          PowerMockito.when(System.nanoTime()).thenReturn(1000000L);
  
          localTracer.finishSpan();
  
          verify(mockCollector).collect(finished);
          verifyNoMoreInteractions(mockCollector);
  
          assertEquals(500L, finished.getDuration().longValue());
      } 
                              #location 14 
                              #vulnerability type NULL_DEREFERENCE