[]byte type alias first to determine len, then determine is slice element is byte

statement.go

@@ -230,12 +230,12 @@ func (stmt *Statement) AddVar(writer clause.Writer, vars ...interface{}) {
 		default:
 			switch rv := reflect.ValueOf(v); rv.Kind() {
 			case reflect.Slice, reflect.Array:
-				if rv.Type().Elem() == reflect.TypeOf(uint8(0)) {
+				if rv.Len() == 0 {
+					writer.WriteString("(NULL)")
+				} else if rv.Type().Elem() == reflect.TypeOf(uint8(0)) {
 					stmt.Vars = append(stmt.Vars, v)
 					stmt.DB.Dialector.BindVarTo(writer, stmt, v)
-				}else if rv.Len() == 0 {
-					writer.WriteString("(NULL)")
-				} else {
+				}else {
 					writer.WriteByte('(')
 					for i := 0; i < rv.Len(); i++ {
 						if i > 0 {