diff --git a/webapp/models/DynData.php b/webapp/models/DynData.php
index 3a748fa..778a3e7 100644
--- a/webapp/models/DynData.php
+++ b/webapp/models/DynData.php
@@ -70,7 +70,10 @@ class DynData extends BaseModel {
 
     public static function calcKey($x, $y)
     {
-        $key = self::calcKey($x, $y);
+        $low32 = (int)$x;
+        $high32 = (int)$y;
+        $key = $low32 + ($high32 << 32);
+        return $key;
     }
 
     private static function internalSetV($x, $y, $val)