diff --git a/index.ts b/index.ts
index 5d7788c..2033c45 100644
--- a/index.ts
+++ b/index.ts
@@ -37,11 +37,13 @@ const cacheFetch = async (url: string): Promise<string> => {
 }
 
 let rules: string[] = [];
-let rulesText: Uint8Array;
+let rulesText: Uint8Array | undefined;
 
 
 const updateList = async () => {
     rules = [];
+    rulesText = undefined;
+    
     for (const filter of filterList) {
         let list = await cacheFetch(filter);