diff --git a/module/VuFind/src/VuFind/Search/Base/Results.php b/module/VuFind/src/VuFind/Search/Base/Results.php
index 8f32ddd4da769059cb67da05865223b49ae16cd4..0b67d09cc5fe5a34627d73a0934e3f2835e6bff6 100644
--- a/module/VuFind/src/VuFind/Search/Base/Results.php
+++ b/module/VuFind/src/VuFind/Search/Base/Results.php
@@ -162,6 +162,7 @@ abstract class Results implements ServiceLocatorAwareInterface
         if (is_object($this->params)) {
             $this->params = clone($this->params);
         }
+        $this->helpers = [];
     }
 
     /**