后台用户管理-马甲-搜索不存在用户名时出错

### **描述此问题**

### **疑似问题重现步骤**

### **报错信息**

### **为解决问题做过哪些尝试**

### **版本信息**

* Discuz! 版本:
* Release 版本:
* 服务器系统版本:
* PHP 版本:
* MySQL / MariaDB 版本:
* 内存缓存类型和版本:
* 浏览器类型和版本:
* 是否自行修改过:

### **其他信息**

### **描述此新需求**

### **新需求操作步骤**

255行

```
		$ips = array();
		$urladd = '';
		if(!empty($_GET['username'])) {
		    $uid = C::t('common_member')->fetch_uid_by_username($_GET['username']);
		    $searchmember = $uid ? C::t('common_member_status')->fetch($uid) : array();
		    $searchmember['username'] = $_GET['username'];
		    $urladd .= '&username='.$_GET['username'];
		} elseif(!empty($_GET['uid'])) {
		    $searchmember = C::t('common_member_status')->fetch($_GET['uid']);
		    $themember = C::t('common_member')->fetch($_GET['uid']);
		    $searchmember['username'] = $themember['username'];
		    $urladd .= '&uid='.$_GET['uid'];
		    unset($_GET['uid']);
		} elseif(!empty($_GET['ip'])) {
		    $regip = $lastip = $_GET['ip'];
		    $ips[] = $_GET['ip'];
		    $search_condition['lastip'] = $_GET['ip'];
		    $urladd .= '&ip='.$_GET['ip'];
		}

if(isset($searchmember)) {
		    $ips = array();
		    foreach(array('regip', 'lastip') as $iptype) {
		        if(isset($searchmember[$iptype]) && $searchmember[$iptype] != 'hidden' && $searchmember[$iptype] != 'Manual Acting') {
		            $ips[] = $searchmember[$iptype];
		        }
		    }
		    $ips = !empty($ips) ? array_unique($ips) : array('unknown');
		}
		$searchmember['username'] .= ' (IP '.implode(',',array_map('dhtmlspecialchars', $ips)).')';
		$membernum = !empty($ips) && $ips[0] != "unknown" ? C::t('common_member_status')->count_by_ip($ips) : C::t('common_member_status')->count();

```

### **为解决问题做过哪些尝试**

### **其他信息**

Discuz/DiscuzX

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