diff --git a/module/VuFind/src/VuFind/ILS/Logic/Holds.php b/module/VuFind/src/VuFind/ILS/Logic/Holds.php
index ac1875751d7..a6b34eb5ce3 100644
--- a/module/VuFind/src/VuFind/ILS/Logic/Holds.php
+++ b/module/VuFind/src/VuFind/ILS/Logic/Holds.php
@@ -539,7 +539,13 @@ protected function getRequestDetails($details, $HMACKeys, $action)
         foreach ($details as $key => $param) {
             $needle = in_array($key, $HMACKeys);
             if ($needle) {
-                $queryString[] = $key . "=" . urlencode($param);
+				// This record in00001878034 fails here  with a null
+				// dch
+				if (is_null($param)) {
+					$queryString[] = $key . "=";
+				} else {
+					$queryString[] = $key . "=" . urlencode($param);
+				}
             }
         }