diff --git a/ui/src/plugins/advent22.ts b/ui/src/plugins/advent22.ts
index 42f3568..535bde1 100644
--- a/ui/src/plugins/advent22.ts
+++ b/ui/src/plugins/advent22.ts
@@ -25,7 +25,7 @@ export class Advent22 {
 
   public api_url(endpoint?: string): string {
     if (endpoint === undefined)
-      return `${this.api_baseurl}`;
+      return this.api_baseurl;
 
     return `${this.api_baseurl}/${endpoint}`;
   }
@@ -66,6 +66,9 @@ export class Advent22 {
         reader.onloadend = () => {
           if (typeof reader.result === "string")
             on_success(reader.result);
+
+          else
+            this.fail(endpoint);
         }
       },
       "blob",