diff --git a/net/ghttp/ghttp_z_unit_issue_test.go b/net/ghttp/ghttp_z_unit_issue_test.go
index 92f761ce9..ee21a906e 100644
--- a/net/ghttp/ghttp_z_unit_issue_test.go
+++ b/net/ghttp/ghttp_z_unit_issue_test.go
@@ -726,3 +726,33 @@ func Test_Issue4093(t *testing.T) {
 		t.Assert(client.PostContent(ctx, "/test"), `{"page":1,"pageSize":10,"pagination":true,"name":"john","number":1}`)
 	})
 }
+
+// https://github.com/gogf/gf/issues/4193
+func Test_Issue4193(t *testing.T) {
+	type Req struct {
+		g.Meta `method:"post" mime:"multipart/form-data"`
+		File   *ghttp.UploadFile `v:"required" type:"file"` // File is required
+	}
+	type Res struct{}
+
+	s := g.Server(guid.S())
+	s.BindMiddlewareDefault(ghttp.MiddlewareHandlerResponse)
+	s.BindHandler("/upload", func(ctx context.Context, req *Req) (res *Res, err error) {
+		return
+	})
+	s.SetDumpRouterMap(false)
+	s.SetAccessLogEnabled(false)
+	s.SetErrorLogEnabled(false)
+	s.Start()
+	defer s.Shutdown()
+	time.Sleep(100 * time.Millisecond)
+
+	gtest.C(t, func(t *gtest.T) {
+		client := g.Client()
+		client.SetPrefix(fmt.Sprintf("http://127.0.0.1:%d", s.GetListenedPort()))
+		content := client.PostContent(ctx, "/upload", g.Map{
+			"file": "",
+		})
+		t.Assert(content, `{"code":51,"message":"The File field is required","data":null}`)
+	})
+}
diff --git a/util/gconv/internal/converter/converter_map.go b/util/gconv/internal/converter/converter_map.go
index e19101e22..bc0834c7d 100644
--- a/util/gconv/internal/converter/converter_map.go
+++ b/util/gconv/internal/converter/converter_map.go
@@ -125,6 +125,7 @@ func (c *Converter) doMapConvert(
 			if len(r) == 0 && mustMapReturn {
 				return map[string]any{}, nil
 			}
+			// if r is not empty, which means it fails converting to map.
 			return nil, nil
 		}
 	case []byte:
@@ -137,6 +138,7 @@ func (c *Converter) doMapConvert(
 			if len(r) == 0 && mustMapReturn {
 				return map[string]any{}, nil
 			}
+			// if r is not empty, which means it fails converting to map.
 			return nil, nil
 		}
 	case map[interface{}]interface{}: