diff --git a/src/NodaWikidataFetcher.php b/src/NodaWikidataFetcher.php
index 3b05eeb..c1e4b90 100644
--- a/src/NodaWikidataFetcher.php
+++ b/src/NodaWikidataFetcher.php
@@ -535,7 +535,10 @@ final class NodaWikidataFetcher {
 
             if (!empty($data['sitelinks'][$lang . 'wiki'])) {
 
-                $wikilink = $data['sitelinks'][$lang . 'wiki']['url'];
+                if (empty($data['sitelinks'][$lang . 'wiki']['url'])) {
+                    $wikilink = '';
+                }
+                else $wikilink = $data['sitelinks'][$lang . 'wiki']['url'];
                 $wikilinkterm = str_replace(' ', '_', $data['sitelinks'][$lang . 'wiki']['title']);
 
                 if (isset($wikilink)) {