output: #fixed code
                               private void updateGC() {
  		if (perfDataSupport) {
  			ygcCount.update(ygcCountCounter.longValue());
  			ygcTimeMills.update(perfData.tickToMills(ygcTimeCounter));
  			if (fullGcCountCounter != null) {
  				fullgcCount.update(fullGcCountCounter.longValue());
  				fullgcTimeMills.update(perfData.tickToMills(fullgcTimeCounter));
  			}
  		} else if (isJmxStateOk()) {
  			try {
  				JmxGarbageCollectorManager gcManager = jmxClient.getGarbageCollectorManager();
  
  				GarbageCollectorMXBean ygcMXBean = gcManager.getYoungCollector();
  				ygcStrategy = gcManager.getYgcStrategy();
  				ygcCount.update(ygcMXBean.getCollectionCount());
  				ygcTimeMills.update(ygcMXBean.getCollectionTime());
  
  				GarbageCollectorMXBean fullgcMXBean = gcManager.getFullCollector();
  				if (fullgcMXBean != null) {
  					fullgcStrategy = gcManager.getFgcStrategy();
  					fullgcCount.update(fullgcMXBean.getCollectionCount());
  					fullgcTimeMills.update(fullgcMXBean.getCollectionTime());
  				}
  			} catch (Exception e) {
  				handleJmxFetchDataError(e);
  			}
  		}
  	}
input: #vulnerable code 
                               private void updateGC() {
  		if (perfDataSupport) {
  			ygcCount.update(ygcCountCounter.longValue());
  			ygcTimeMills.update(perfData.tickToMills(ygcTimeCounter));
  			if (fullGcCountCounter != null) {
  				fullgcCount.update(fullGcCountCounter.longValue());
  				fullgcTimeMills.update(perfData.tickToMills(fullgcTimeCounter));
  			}
  		} else if (isJmxStateOk()) {
  			try {
  				ygcCount.update(jmxClient.getGarbageCollectorManager().getYoungCollector().getCollectionCount());
  				ygcTimeMills.update(jmxClient.getGarbageCollectorManager().getYoungCollector().getCollectionTime());
  
  				if (jmxClient.getGarbageCollectorManager().getFullCollector() != null) {
  					fullgcCount.update(jmxClient.getGarbageCollectorManager().getFullCollector().getCollectionCount());
  					fullgcTimeMills
  							.update(jmxClient.getGarbageCollectorManager().getFullCollector().getCollectionTime());
  				}
  			} catch (Exception e) {
  				handleJmxFetchDataError(e);
  			}
  		}
  	} 
                              #location 11 
                              #vulnerability type NULL_DEREFERENCE