请问一下我的 SQL 为什么报错了呢？是哪里的问题呢？ [ 2.0 版本 ]

$result = (new Query())->select([
    'ad_id',
    'ad_img',
    'ad_url',
    'ad_name',
    'start_time',
    'end_time'
])
    ->from('warehouse_ad')
    ->where($condition)
    ->andWhere('<','start_time',date('Y-m-d H:i:s',time()))
    ->andWhere('>','end_time',date('Y-m-d H:i:s',time()))
    ->orderBy('ad_sort')
    ->all();

PHP Warning – yii\base\ErrorException
Invalid argument supplied for foreach()
1. in D:\root\PHPTutorial\WWW\kjy\warehouse\vendor\yiisoft\yii2\db\Query.php at line 1006
9979989991000100110021003100410051006100710081009101010111012101310141015     * @return $this the query object itself
     * @see params()
     */
    public function addParams($params)
    {
        if (!empty($params)) {
            if (empty($this->params)) {
                $this->params = $params;
            } else {
                foreach ($params as $name => $value) {
                    if (is_int($name)) {
                        $this->params[] = $value;
                    } else {
                        $this->params[$name] = $value;
                    }
                }
            }
        }
        return $this;
2. in D:\root\PHPTutorial\WWW\kjy\warehouse\vendor\yiisoft\yii2\db\Query.php at line 1006 – yii\base\ErrorHandler::handleError(2, 'Invalid argument supplied for fo...', 'D:\root\PHPTutorial\WWW\kjy\ware...', 1006, ...)
3. in D:\root\PHPTutorial\WWW\kjy\warehouse\vendor\yiisoft\yii2\db\Query.php at line 599 – yii\db\Query::addParams('end_time')
4. in D:\root\PHPTutorial\WWW\kjy\warehouse\common\DataCache.php at line 766 – yii\db\Query::andWhere('>', 'end_time', '2019-03-19 18:22:52')