fix sentry errors (#20005)

apps/web/app/api/avatar/[uuid]/route.ts

@@ -4,7 +4,7 @@ import type { NextRequest } from "next/server";
 import { NextResponse } from "next/server";
 import { z } from "zod";
 
-import { AVATAR_FALLBACK } from "@calcom/lib/constants";
+import { AVATAR_FALLBACK, WEBAPP_URL } from "@calcom/lib/constants";
 import prisma from "@calcom/prisma";
 
 const querySchema = z.object({
@@ -47,7 +47,8 @@ async function handler(req: NextRequest, { params }: { params: Params }) {
     img = data;
   } catch (e) {
     // If anything goes wrong or avatar is not found, use default avatar
-    return NextResponse.redirect(AVATAR_FALLBACK, 302);
+    const url = new URL(AVATAR_FALLBACK, WEBAPP_URL).toString();
+    return NextResponse.redirect(url, 302);
   }
 
   const decoded = img.toString().replace("data:image/png;base64,", "").replace("data:image/jpeg;base64,", "");