diff --git a/webapp/models/DynData.php b/webapp/models/DynData.php
index 5f71a89..1aa4d4d 100644
--- a/webapp/models/DynData.php
+++ b/webapp/models/DynData.php
@@ -160,8 +160,8 @@ class DynData extends BaseModel {
     {
         $key = self::calcKey($x, $y);
         if (self::$dynData) {
-            if (isset($dynData[$key])) {
-                return $dynData[$key];
+            if (isset(self::$dynData[$key])) {
+                return self::$dynData[$key];
             } else {
                 return array(
                     'val' => $defVal,