diff --git a/encoding/gjson/gjson.go b/encoding/gjson/gjson.go
index 23e685fa3..e1f512067 100644
--- a/encoding/gjson/gjson.go
+++ b/encoding/gjson/gjson.go
@@ -40,7 +40,7 @@ const (
 
 // Json is the customized JSON struct.
 type Json struct {
-	mu *rwmutex.RWMutex
+	mu rwmutex.RWMutex
 	p  *interface{} // Pointer for hierarchical data access, it's the root of data in default.
 	c  byte         // Char separator('.' in default).
 	vc bool         // Violence Check(false in default), which is used to access data when the hierarchical data key contains separator char.
@@ -358,6 +358,9 @@ func (j *Json) setPointerWithValue(pointer *interface{}, key string, value inter
 
 // getPointerByPattern returns a pointer to the value by specified `pattern`.
 func (j *Json) getPointerByPattern(pattern string) *interface{} {
+	if j.p == nil {
+		return nil
+	}
 	if j.vc {
 		return j.getPointerByPatternWithViolenceCheck(pattern)
 	} else {
diff --git a/encoding/gjson/gjson_api.go b/encoding/gjson/gjson_api.go
index e3773f121..5accf4606 100644
--- a/encoding/gjson/gjson_api.go
+++ b/encoding/gjson/gjson_api.go
@@ -22,6 +22,9 @@ func (j *Json) Interface() interface{} {
 	}
 	j.mu.RLock()
 	defer j.mu.RUnlock()
+	if j.p == nil {
+		return nil
+	}
 	return *(j.p)
 }
 
diff --git a/encoding/gjson/gjson_api_new_load.go b/encoding/gjson/gjson_api_new_load.go
index 5d6dfd910..ec45f55df 100644
--- a/encoding/gjson/gjson_api_new_load.go
+++ b/encoding/gjson/gjson_api_new_load.go
@@ -95,7 +95,7 @@ func NewWithOptions(data interface{}, options Options) *Json {
 			vc: false,
 		}
 	}
-	j.mu = rwmutex.New(options.Safe)
+	j.mu = rwmutex.Create(options.Safe)
 	return j
 }
 
diff --git a/encoding/gjson/gjson_implements.go b/encoding/gjson/gjson_implements.go
index 2e9b547dc..cde121924 100644
--- a/encoding/gjson/gjson_implements.go
+++ b/encoding/gjson/gjson_implements.go
@@ -37,10 +37,16 @@ func (j *Json) UnmarshalValue(value interface{}) error {
 
 // MapStrAny implements interface function MapStrAny().
 func (j *Json) MapStrAny() map[string]interface{} {
+	if j == nil {
+		return nil
+	}
 	return j.Map()
 }
 
 // Interfaces implements interface function Interfaces().
 func (j *Json) Interfaces() []interface{} {
+	if j == nil {
+		return nil
+	}
 	return j.Array()
 }
diff --git a/net/ghttp/ghttp_server_graceful.go b/net/ghttp/ghttp_server_graceful.go
index 073f9f867..306b8e38b 100644
--- a/net/ghttp/ghttp_server_graceful.go
+++ b/net/ghttp/ghttp_server_graceful.go
@@ -198,13 +198,13 @@ func (s *gracefulServer) getNetListener() (net.Listener, error) {
 		f := os.NewFile(s.fd, "")
 		ln, err = net.FileListener(f)
 		if err != nil {
-			err = gerror.Wrapf(err, "%d: net.FileListener failed", gproc.Pid())
+			err = gerror.Wrap(err, "net.FileListener failed")
 			return nil, err
 		}
 	} else {
 		ln, err = net.Listen("tcp", s.httpServer.Addr)
 		if err != nil {
-			err = gerror.Wrapf(err, "%d: net.Listen failed", gproc.Pid())
+			err = gerror.Wrapf(err, `net.Listen address "%s" failed`, s.httpServer.Addr)
 		}
 	}
 	return ln, err
diff --git a/net/ghttp/ghttp_z_unit_issue_test.go b/net/ghttp/ghttp_z_unit_issue_test.go
index 0e5a1ca5f..0eefcef8b 100644
--- a/net/ghttp/ghttp_z_unit_issue_test.go
+++ b/net/ghttp/ghttp_z_unit_issue_test.go
@@ -12,6 +12,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/gogf/gf/v2/encoding/gjson"
 	"github.com/gogf/gf/v2/frame/g"
 	"github.com/gogf/gf/v2/net/ghttp"
 	"github.com/gogf/gf/v2/test/gtest"
@@ -223,3 +224,43 @@ func Test_Issue662(t *testing.T) {
 		t.Assert(c.PostContent(ctx, "/boot/test", dataReq), `{"code":51,"message":"The code is required","data":null}`)
 	})
 }
+
+type DemoReq struct {
+	g.Meta `path:"/demo" method:"post"`
+	Data   *gjson.Json
+}
+
+type DemoRes struct {
+	Content string
+}
+
+type Api struct{}
+
+func (a *Api) Demo(ctx context.Context, req *DemoReq) (res *DemoRes, err error) {
+	return &DemoRes{
+		Content: req.Data.MustToJsonString(),
+	}, err
+}
+
+var api = Api{}
+
+// https://github.com/gogf/gf/issues/2172
+func Test_Issue2172(t *testing.T) {
+	s := g.Server(guid.S())
+	s.Use(ghttp.MiddlewareHandlerResponse)
+	s.Group("/", func(group *ghttp.RouterGroup) {
+		group.Bind(api)
+	})
+	s.SetPort(8888)
+	s.SetDumpRouterMap(false)
+	s.Start()
+	defer s.Shutdown()
+	time.Sleep(1000 * time.Millisecond)
+
+	gtest.C(t, func(t *gtest.T) {
+		c := g.Client()
+		c.SetPrefix(fmt.Sprintf("http://127.0.0.1:%d", s.GetListenedPort()))
+		dataReq := `{"data":{"asd":1}}`
+		t.Assert(c.PostContent(ctx, "/demo", dataReq), `{"code":0,"message":"","data":{"Content":"{\"asd\":1}"}}`)
+	})
+}