diff --git a/hwe/sammo/API/Global/GetCachedMap.php b/hwe/sammo/API/Global/GetCachedMap.php
index fff67442..c93aa26c 100644
--- a/hwe/sammo/API/Global/GetCachedMap.php
+++ b/hwe/sammo/API/Global/GetCachedMap.php
@@ -55,7 +55,11 @@ class GetCachedMap extends \sammo\BaseAPI
       return 'cache 불가';
     }
 
-    $storage = new \Nette\Caching\Storages\FileStorage('data/file_cache');
+    $absolutePath = realpath('data/file_cache');
+    if (!$absolutePath) {
+      return 'cache 불가';
+    }
+    $storage = new \Nette\Caching\Storages\FileStorage($absolutePath);
     $cache = new Cache($storage);
 
     $now = TimeUtil::nowDateTimeImmutable();
diff --git a/hwe/sammo/API/Global/GetConst.php b/hwe/sammo/API/Global/GetConst.php
index ce4f0f73..b8693992 100644
--- a/hwe/sammo/API/Global/GetConst.php
+++ b/hwe/sammo/API/Global/GetConst.php
@@ -288,6 +288,10 @@ class GetConst extends \sammo\BaseAPI
         if (!prepareDir($cacheDir)) {
             throw new RuntimeException('cache 폴더 없음');
         }
+        $absolutePath = realpath($cacheDir);
+        if (!$absolutePath) {
+            throw new RuntimeException('cache 폴더 없음');
+        }
         $storage = new \Nette\Caching\Storages\FileStorage($cacheDir);
         $cache = new Cache($storage);