diff --git a/src/app/core/browse/browse.service.ts b/src/app/core/browse/browse.service.ts
index b210b34949..58bbc0b870 100644
--- a/src/app/core/browse/browse.service.ts
+++ b/src/app/core/browse/browse.service.ts
@@ -105,7 +105,7 @@ export class BrowseService {
       })
     );
     if (options.fetchThumbnail ) {
-      return this.hrefOnlyDataService.findListByHref<BrowseEntry>(href$, {}, null, null, ...BROWSE_LINKS_TO_FOLLOW);
+      return this.hrefOnlyDataService.findListByHref<BrowseEntry>(href$, {}, undefined, undefined, ...BROWSE_LINKS_TO_FOLLOW);
     }
     return this.hrefOnlyDataService.findListByHref<BrowseEntry>(href$);
   }
@@ -153,7 +153,7 @@ export class BrowseService {
       }),
     );
     if (options.fetchThumbnail) {
-      return this.hrefOnlyDataService.findListByHref<Item>(href$, {}, null, null, ...BROWSE_LINKS_TO_FOLLOW);
+      return this.hrefOnlyDataService.findListByHref<Item>(href$, {}, undefined, undefined, ...BROWSE_LINKS_TO_FOLLOW);
     }
     return this.hrefOnlyDataService.findListByHref<Item>(href$);
   }