diff --git a/nextcloud-upload/run.js b/nextcloud-upload/run.js
index bbc39d4..b7730b0 100644
--- a/nextcloud-upload/run.js
+++ b/nextcloud-upload/run.js
@@ -50,7 +50,7 @@ async function upload() {
             });
             if (response.status != 404) {
                 let data = JSON.parse(xml.toJson(response.data));
-                let dirs = data["d:multistatus"]["d:response"]?.slice(1) || [];
+                let dirs = data["d:multistatus"]["d:response"]?.slice?.(1) || [];
                 // sort directories by last modified
                 dirs.sort((a, b) => new Date(a["d:propstat"]["d:prop"]["d:getlastmodified"]) - new Date(b["d:propstat"]["d:prop"]["d:getlastmodified"]));
                 while (dirs.length >= parseInt(retentionAmount)) {