diff --git a/proxy/blackhole/blackhole.go b/proxy/blackhole/blackhole.go
index ce3fe63a..b324a97a 100644
--- a/proxy/blackhole/blackhole.go
+++ b/proxy/blackhole/blackhole.go
@@ -29,8 +29,8 @@ func New(ctx context.Context, config *Config) (*Handler, error) {
 }
 
 // Process implements OutboundHandler.Dispatch().
-func (v *Handler) Process(ctx context.Context, outboundRay ray.OutboundRay, dialer proxy.Dialer) error {
-	v.response.WriteTo(outboundRay.OutboundOutput())
+func (h *Handler) Process(ctx context.Context, outboundRay ray.OutboundRay, dialer proxy.Dialer) error {
+	h.response.WriteTo(outboundRay.OutboundOutput())
 	// Sleep a little here to make sure the response is sent to client.
 	time.Sleep(time.Second)
 	outboundRay.OutboundOutput().CloseError()
diff --git a/proxy/blackhole/config.go b/proxy/blackhole/config.go
index 2c27a344..88c58c9a 100644
--- a/proxy/blackhole/config.go
+++ b/proxy/blackhole/config.go
@@ -1,6 +1,7 @@
 package blackhole
 
 import (
+	"v2ray.com/core/common"
 	"v2ray.com/core/common/buf"
 	"v2ray.com/core/common/serial"
 )
@@ -27,7 +28,7 @@ func (*NoneResponse) WriteTo(buf.Writer) {}
 // WriteTo implements ResponseConfig.WriteTo().
 func (*HTTPResponse) WriteTo(writer buf.Writer) {
 	b := buf.NewLocal(512)
-	b.AppendSupplier(serial.WriteString(http403response))
+	common.Must(b.AppendSupplier(serial.WriteString(http403response)))
 	writer.Write(buf.NewMultiBufferValue(b))
 }