Fix error in items sorting when serial isssue number is null (vufind-…

…org#3301)
demiankatz · Jan 9, 2024 · 42d26e9 · 42d26e9
1 parent 6c94e4a
commit 42d26e9
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/module/VuFind/src/VuFind/ILS/Driver/KohaRest.php b/module/VuFind/src/VuFind/ILS/Driver/KohaRest.php
@@ -2142,7 +2142,7 @@ protected function statusSortFunction($a, $b)
         $result = $this->getSorter()->compare($a['location'], $b['location']);
 
         if (0 === $result && $this->sortItemsBySerialIssue) {
-            $result = strnatcmp($a['number'], $b['number']);
+            $result = strnatcmp($a['number'] ?? '', $b['number'] ?? '');
         }
 
         if (0 === $result) {