diff --git a/module/VuFind/src/VuFind/ILS/Driver/MultiBackend.php b/module/VuFind/src/VuFind/ILS/Driver/MultiBackend.php
index b83645dc61971771b8ce86e1587730adf77c1834..d274556700e557a37c4faa1cef244243c503ad50 100644
--- a/module/VuFind/src/VuFind/ILS/Driver/MultiBackend.php
+++ b/module/VuFind/src/VuFind/ILS/Driver/MultiBackend.php
@@ -1173,7 +1173,10 @@ class MultiBackend extends AbstractBase
             $source = $this->defaultDriver;
         }
         if (!$source) {
-            return false;
+            // If we can't determine the source, assume we are capable to handle
+            // the request. This might happen e.g. when the user hasn't yet done
+            // a catalog login.
+            return true;
         }
 
         $driver = $this->getDriver($source);