diff --git a/module/bug/model.php b/module/bug/model.php
index dad2de58be..ffacd7ed8a 100644
--- a/module/bug/model.php
+++ b/module/bug/model.php
@@ -3302,7 +3302,7 @@ class bugModel extends model
         foreach($browserList as $value)
         {
             if(empty($value)) continue;
-            $browser .= $this->lang->bug->browserList[$value] . ',';
+            $browser .= zget($this->lang->bug->browserList, $value) . ',';
         }
         $os      = trim($os, ',');
         $browser = trim($browser, ',');
diff --git a/module/extension/model.php b/module/extension/model.php
index b34b2f9b27..fa10ae4fa2 100644
--- a/module/extension/model.php
+++ b/module/extension/model.php
@@ -630,9 +630,17 @@ class extensionModel extends model
     public function cleanModelCache()
     {
         $modelCacheFiles = glob($this->app->getTmpRoot() . 'model/*');
+        $zfile = $this->app->loadClass('zfile');
         foreach($modelCacheFiles as $cacheFile)
         {
-            if(is_writable($cacheFile) and !is_dir($cacheFile)) @unlink($cacheFile);
+            if(is_dir($cacheFile))
+            {
+                $zfile->removeDir($cacheFile);
+            }
+            elseif(is_writable($cacheFile) and !is_dir($cacheFile))
+            {
+                @unlink($cacheFile);
+            }
         }
     }