diff --git a/metric/prometheus.go b/metric/prometheus.go
index 1be333e..9663db3 100644
--- a/metric/prometheus.go
+++ b/metric/prometheus.go
@@ -119,10 +119,6 @@ func (pe *prometheusExporter) loop(ctx context.Context) {
 		case nm := <-pe.registerChan:
 			var nextmetrics map[string]*prometheusMetricDesc
 			if collector != nil {
-				if collector.metrics[nm.key] != nil {
-					break
-				}
-
 				nextmetrics = collector.metrics
 				prometheus.Unregister(collector)
 				nextmetrics[nm.key] = nm
@@ -132,12 +128,14 @@ func (pe *prometheusExporter) loop(ctx context.Context) {
 				}
 			}
 
-			collector = &prometheusCollector{
+			nextcollector := &prometheusCollector{
 				metrics: nextmetrics,
 			}
 
-			if err := prometheus.Register(collector); err != nil {
+			if err := prometheus.Register(nextcollector); err != nil {
 				logger.Error("prometheus register err :", *nm, err)
+			} else {
+				collector = nextcollector
 			}
 		}
 	}