diff --git a/script/buct-cource-copy.js b/script/buct-cource-copy.js
index 2dc6975..dc87778 100644
--- a/script/buct-cource-copy.js
+++ b/script/buct-cource-copy.js
@@ -40,9 +40,9 @@
                 });
             } catch {
                 await new Promise((resolve) => setTimeout(resolve, 1000));
-                return poll();
+                return this.poll();
             }
-            poll();
+            this.poll();
             try {
                 const data = await res.json();
                 if (data.status !== "nothing") {