diff --git a/static/js/indexDB.js b/static/js/indexDB.js
index 0e123cf5..05d6185d 100644
--- a/static/js/indexDB.js
+++ b/static/js/indexDB.js
@@ -8,9 +8,9 @@ class indexDB {
     var site_url = "/"+window.location.pathname.split('/')[1];
     const text = await getTextFromFileUrlAsync(site_url+"/data/index.yaml",{"Cache-Control":`max-age=${maxAge}`})
     const myYaml = jsyaml.load(text);
-    db.sets = ((myYaml.sets === undefined) ? new Map() : new Map(Object.entries(myYaml.sets)));
-    db.others = ((myYaml.others === undefined) ? [] : Array.from(myYaml.others));
-    db.reviews = ((myYaml.reviews === undefined) ? [] : Array.from(myYaml.reviews));
+    db.sets = ((myYaml.sets == null) ? new Map() : new Map(Object.entries(myYaml.sets)));
+    db.others = ((myYaml.others == null) ? [] : Array.from(myYaml.others));
+    db.reviews = ((myYaml.reviews == null) ? [] : Array.from(myYaml.reviews));
     window.indexDB=db
     return db
   }