diff --git a/client/custom_exporter.go b/client/custom_exporter.go
index 911fc51..68441f7 100644
--- a/client/custom_exporter.go
+++ b/client/custom_exporter.go
@@ -30,7 +30,7 @@ type metricValueAccessor struct {
 	ptr *uint64
 }
 
-func (va metricValueAccessor) set(val float64) {
+func (va *metricValueAccessor) set(val float64) {
 	atomic.StoreUint64(va.ptr, math.Float64bits(val))
 }
 
@@ -69,6 +69,7 @@ func (e *exporterForPrometheus) registMetric(namespace string, desc metric.Metri
 func (e *exporterForPrometheus) Describe(ch chan<- *prometheus.Desc) {
 	ptr := atomic.LoadPointer(&e.metricPtr)
 	container := *(*[]metricDesc)(ptr)
+
 	for _, v := range container {
 		ch <- v.Desc
 	}
@@ -77,6 +78,7 @@ func (e *exporterForPrometheus) Describe(ch chan<- *prometheus.Desc) {
 func (e *exporterForPrometheus) Collect(ch chan<- prometheus.Metric) {
 	ptr := atomic.LoadPointer(&e.metricPtr)
 	container := *(*[]metricDesc)(ptr)
+
 	for _, v := range container {
 		ch <- prometheus.MustNewConstMetric(v.Desc, v.valueType, math.Float64frombits(atomic.LoadUint64(v.val)))
 	}
diff --git a/client/operation.go b/client/operation.go
index afe9c97..0996521 100644
--- a/client/operation.go
+++ b/client/operation.go
@@ -277,14 +277,16 @@ func (hc *houstonClient) launch(meta *procmeta) error {
 							exporter := newExporterForPrometheus()
 							accessor := exporter.registMetric(hc.config.MetricNamespace, metric)
 
-							prometheus.Register(exporter)
-
-							metricValues[metric.Key] = accessor
-							logger.Println("metric registered :", metric)
+							if err := prometheus.Register(exporter); err != nil {
+								logger.Println("prometheus.Register error :", err)
+							} else {
+								metricValues[metric.Key] = accessor
+								logger.Println("metric registered :", metric)
+							}
 						}
 					} else {
 						keybytes := metricBuffer[:8]
-						valbits := binary.BigEndian.Uint64(metricBuffer[8:])
+						valbits := binary.LittleEndian.Uint64(metricBuffer[8:])
 						val := math.Float64frombits(valbits)
 
 						if accessor, ok := metricValues[string(keybytes)]; ok {