diff --git a/src/NodaWikidataFetcher.php b/src/NodaWikidataFetcher.php
index e97c24f..04e581f 100644
--- a/src/NodaWikidataFetcher.php
+++ b/src/NodaWikidataFetcher.php
@@ -697,6 +697,7 @@ final class NodaWikidataFetcher {
 
         foreach ($nodaLinks as $noda_source => $nodaId) {
 
+            if ($nodaId === null) continue;
             if (!isset(self::URL_PREFIXES_PLACES_NODA_SOURCE[$noda_source])) {
                 throw new Exception("Unknown noda link: " . $noda_source);
             }