diff --git a/src/note_view.ts b/src/note_view.ts
index ebcd32c..f7320c7 100644
--- a/src/note_view.ts
+++ b/src/note_view.ts
@@ -78,9 +78,10 @@ export class ArcSidebarNoteView extends ItemView {
       return [];
 
     const cache = this.plugin.app.metadataCache.getFileCache(file);
+    const tags = cache?.tags === undefined ? [] : cache.tags!;
     return []
       .concat(cache?.frontmatter?.tags)
-      .concat(cache?.tags?.map((t) => t.tag.substring(1)))
+      .concat(tags.map((t) => t.tag.substring(1)))
       .filter((v, i, a) => a.indexOf(v) === i && (<string>v)?.startsWith('arc'));
    }
 }
\ No newline at end of file