fatal error: concurrent map writes

[mycode65678]

The gin framework I use will cause fatal errors when there are too many concurrent accesses.

fatal error: concurrent map writes

// implements the binding.StructValidator
type customValidator struct{}

func (c *customValidator) ValidateStruct(ptr interface{}) error {

	govalidator.ParamTagMap["google"] = govalidator.ParamValidator(func(str string, params ...string) bool {
		a.Log.Debug("customGoogle ParamTagMap")
		return false
	})
	govalidator.ParamTagMap["google"] = govalidator.ParamValidator(func(str string, params ...string) bool {
		a.Log.Debug("customGoogle ParamTagMap")
		return false
	})

	// Add your own struct validation tags with parameter
	govalidator.ParamTagMap["compared"] = govalidator.ParamValidator(func(str string, params ...string) bool {
		res := reflect.ValueOf(ptr).Elem().FieldByName(params[0]).Interface().(string)
		return str == res
	})

	//register the regex for validate
	govalidator.ParamTagRegexMap["compared"] = regexp.MustCompile("^compared\\((\\w+)\\)$")
	if _, err := govalidator.ValidateStruct(ptr); err != nil {
		a.Log.Errorf("ValidateStruct err:%v", err)
		return err
	}
	return nil
}

func (c *customValidator) Engine() interface{} {
	return nil
}

func main(){
	binding.Validator = &customValidator{}
        r := gin.Default()
	r.Run(":9191")
}