diff --git a/app/router/strategy_leastload.go b/app/router/strategy_leastload.go
index e4620725..1bf3cbc0 100644
--- a/app/router/strategy_leastload.go
+++ b/app/router/strategy_leastload.go
@@ -139,6 +139,10 @@ func (s *LeastLoadStrategy) selectLeastLoad(nodes []*node) []*node {
 }
 
 func (s *LeastLoadStrategy) getNodes(candidates []string, maxRTT time.Duration) []*node {
+	if s.observer == nil {
+		errors.LogError(s.ctx, "observer is nil")
+		return make([]*node, 0)
+	}
 	observeResult, err := s.observer.GetObservation(s.ctx)
 	if err != nil {
 		errors.LogInfoInner(s.ctx, err, "cannot get observation")
diff --git a/app/router/strategy_leastping.go b/app/router/strategy_leastping.go
index f4e53ed7..ada3492d 100644
--- a/app/router/strategy_leastping.go
+++ b/app/router/strategy_leastping.go
@@ -28,9 +28,13 @@ func (l *LeastPingStrategy) InjectContext(ctx context.Context) {
 }
 
 func (l *LeastPingStrategy) PickOutbound(strings []string) string {
+	if l.observatory == nil {
+		errors.LogError(l.ctx, "observer is nil")
+		return ""
+	}
 	observeReport, err := l.observatory.GetObservation(l.ctx)
 	if err != nil {
-		errors.LogInfoInner(l.ctx, err, "cannot get observe report")
+		errors.LogInfoInner(l.ctx, err, "cannot get observer report")
 		return ""
 	}
 	outboundsList := outboundList(strings)