diff --git a/src/bind.inc.php b/src/bind.inc.php
index 39c6a08..3eef75a 100644
--- a/src/bind.inc.php
+++ b/src/bind.inc.php
@@ -17,12 +17,15 @@ class BindEclLitePlugin implements \bhl_bind\BindPlugin
   function init(\mtgMetaInfo $meta, \Twig\Environment $twig)
   {
     $loader = $twig->getLoader();
-    $loader->setPaths(
-      array_merge(
-        $loader->getPaths(), 
-        [__DIR__ . "/../tpl"]
-      )
-    );
+    if($loader instanceof \Twig\Loader\FilesystemLoader)
+    {
+      $loader->setPaths(
+        array_merge(
+          $loader->getPaths(), 
+          [__DIR__ . "/../tpl"]
+        )
+      );
+    }
 
     //let's collect units we're responsible for
     foreach($meta->getUnits() as $u)