diff --git a/app/proxyman/config.go b/app/proxyman/config.go
index 302d208f..16506627 100644
--- a/app/proxyman/config.go
+++ b/app/proxyman/config.go
@@ -53,6 +53,10 @@ type SniffingMatcher struct {
 func NewSniffingMatcher(sc *SniffingConfig) (*SniffingMatcher, error) {
 	m := new(SniffingMatcher)
 
+	if sc == nil {
+		return m, nil
+	}
+
 	if sc.DomainsExcluded != nil {
 		exDomain, err := domain.NewDomainMatcher(sc.DomainsExcluded)
 		if err != nil {
diff --git a/app/router/condition_test.go b/app/router/condition_test.go
index 2ee1c020..e4f20341 100644
--- a/app/router/condition_test.go
+++ b/app/router/condition_test.go
@@ -359,7 +359,7 @@ func TestChinaSites(t *testing.T) {
 	domains, err := loadGeoSite("CN")
 	common.Must(err)
 
-	matcher, err := NewDomainMatcher(domains)
+	matcher, err := domain.NewDomainMatcher(domains)
 	common.Must(err)
 
 	type TestCase struct {