diff --git a/encoding/ghtml/ghtml.go b/encoding/ghtml/ghtml.go
index da0b798cd..34fa027aa 100644
--- a/encoding/ghtml/ghtml.go
+++ b/encoding/ghtml/ghtml.go
@@ -12,6 +12,8 @@ import (
 	"reflect"
 	"strings"
 
+	"github.com/gogf/gf/v2/errors/gcode"
+	"github.com/gogf/gf/v2/errors/gerror"
 	strip "github.com/grokify/html-strip-tags-go"
 )
 
@@ -60,15 +62,26 @@ func SpecialCharsDecode(s string) string {
 }
 
 // SpecialCharsMapOrStruct automatically encodes string values/attributes for map/struct.
+//
+// Note that, if operation on struct, the given parameter `mapOrStruct` should be type of pointer to struct.
+//
+// For example:
+// var m = map{}
+// var s = struct{}{}
+// OK: SpecialCharsMapOrStruct(m)
+// OK: SpecialCharsMapOrStruct(&s)
+// Error: SpecialCharsMapOrStruct(s)
 func SpecialCharsMapOrStruct(mapOrStruct interface{}) error {
 	var (
 		reflectValue = reflect.ValueOf(mapOrStruct)
 		reflectKind  = reflectValue.Kind()
+		originalKind = reflectKind
 	)
 	for reflectValue.IsValid() && (reflectKind == reflect.Ptr || reflectKind == reflect.Interface) {
 		reflectValue = reflectValue.Elem()
 		reflectKind = reflectValue.Kind()
 	}
+
 	switch reflectKind {
 	case reflect.Map:
 		var (
@@ -82,22 +95,43 @@ func SpecialCharsMapOrStruct(mapOrStruct interface{}) error {
 				reflectValue.SetMapIndex(key, reflect.ValueOf(SpecialChars(mapValue.String())))
 			case reflect.Interface:
 				if mapValue.Elem().Kind() == reflect.String {
-					reflectValue.SetMapIndex(key, reflect.ValueOf(SpecialChars(mapValue.Elem().String())))
+					reflectValue.SetMapIndex(
+						key,
+						reflect.ValueOf(SpecialChars(mapValue.Elem().String())),
+					)
 				}
+			default:
 			}
 		}
 
 	case reflect.Struct:
-		var (
-			fieldValue reflect.Value
-		)
+		if originalKind != reflect.Ptr {
+			return gerror.NewCodef(
+				gcode.CodeInvalidParameter,
+				`invalid input parameter type "%s", should be type of pointer to struct`,
+				reflect.TypeOf(mapOrStruct).String(),
+			)
+		}
+		var fieldValue reflect.Value
 		for i := 0; i < reflectValue.NumField(); i++ {
 			fieldValue = reflectValue.Field(i)
 			switch fieldValue.Kind() {
 			case reflect.String:
-				fieldValue.Set(reflect.ValueOf(SpecialChars(fieldValue.String())))
+				fieldValue.Set(
+					reflect.ValueOf(
+						SpecialChars(fieldValue.String()),
+					),
+				)
+			default:
 			}
 		}
+
+	default:
+		return gerror.NewCodef(
+			gcode.CodeInvalidParameter,
+			`invalid input parameter type "%s"`,
+			reflect.TypeOf(mapOrStruct).String(),
+		)
 	}
 	return nil
 }
diff --git a/encoding/ghtml/ghtml_z_unit_test.go b/encoding/ghtml/ghtml_z_unit_test.go
index 8ac444753..41b06912d 100644
--- a/encoding/ghtml/ghtml_z_unit_test.go
+++ b/encoding/ghtml/ghtml_z_unit_test.go
@@ -78,4 +78,14 @@ func Test_SpecialCharsMapOrStruct_Struct(t *testing.T) {
 		t.Assert(a.Title, `&lt;h1&gt;T&lt;/h1&gt;`)
 		t.Assert(a.Content, `&lt;div&gt;C&lt;/div&gt;`)
 	})
+
+	// should error
+	gtest.C(t, func(t *gtest.T) {
+		a := A{
+			Title:   "<h1>T</h1>",
+			Content: "<div>C</div>",
+		}
+		err := ghtml.SpecialCharsMapOrStruct(a)
+		t.AssertNE(err, nil)
+	})
 }