diff --git a/web/js/010-libphotofloat.js b/web/js/010-libphotofloat.js
index d1defad..2a54813 100644
--- a/web/js/010-libphotofloat.js
+++ b/web/js/010-libphotofloat.js
@@ -85,7 +85,7 @@
 				cacheKey = subalbum;
 			else
 				cacheKey = PhotoFloat.cachePath(subalbum.parent.path + "/" + subalbum.path);
-			if (cacheKey in this.albumCache) {
+			if (this.albumCache.hasOwnProperty(cacheKey)) {
 				callback(this.albumCache[cacheKey]);
 				return;
 			}
@@ -158,4 +158,4 @@
 		return PhotoFloat;
 	})();
 	window.PhotoFloat = PhotoFloat;
-}).call(this);
\ No newline at end of file
+}).call(this);