diff --git a/app/code/Magento/Ui/Model/Export/SearchResultIterator.php b/app/code/Magento/Ui/Model/Export/SearchResultIterator.php
index aa584c3f7e7e3..b0ce047ef46bc 100644
--- a/app/code/Magento/Ui/Model/Export/SearchResultIterator.php
+++ b/app/code/Magento/Ui/Model/Export/SearchResultIterator.php
@@ -58,6 +58,6 @@ public function rewind()
      */
     public function valid()
     {
-        return (bool)$this->key();
+        return !is_null($this->key());
     }
 }