diff --git a/app/common.php b/app/common.php
index b7a2978..bcc2cf2 100644
--- a/app/common.php
+++ b/app/common.php
@@ -204,10 +204,12 @@ function array2level($array, $pid = 0, $level = 1)
         $level = 1;
     }
     foreach ($array as $v) {
-        if ($v['pid'] == $pid) {
-            $v['level'] = $level;
-            $list[]     = $v;
-            array2level($array, $v['id'], $level + 1);
+        if(!empty($v)) {
+            if ($v['pid'] == $pid) {
+                $v['level'] = $level;
+                $list[]     = $v;
+                array2level($array, $v['id'], $level + 1);
+            }
         }
     }
     // halt($list);