diff --git a/src/app/api/goals/route.ts b/src/app/api/goals/route.ts
index 0d616ebd3..b4b83346b 100644
--- a/src/app/api/goals/route.ts
+++ b/src/app/api/goals/route.ts
@@ -239,7 +239,7 @@ try {
   let safeDeadline: string | null = null;
   if (typeof deadline === "string") {
     const d = new Date(deadline);
-    if (!isNaN(d.getTime())) {
+    if (!Number.isNaN(d.getTime())) {
       d.setUTCHours(23, 59, 59, 999);
       safeDeadline = d.toISOString();
     }
diff --git a/src/app/api/milestones/route.ts b/src/app/api/milestones/route.ts
index 4019a3d7f..19ec9c30c 100644
--- a/src/app/api/milestones/route.ts
+++ b/src/app/api/milestones/route.ts
@@ -92,7 +92,7 @@ export async function POST(req: Request) {
       ? unit.trim().slice(0, MAX_UNIT_LEN)
       : "units";
 
-  if (typeof targetDate !== "string" || isNaN(new Date(targetDate).getTime())) {
+  if (typeof targetDate !== "string" || Number.isNaN(new Date(targetDate).getTime())) {
     return NextResponse.json({ error: "targetDate must be a valid date string" }, { status: 400 });
   }
 
diff --git a/src/app/api/user/export/route.ts b/src/app/api/user/export/route.ts
index cdd04e3fe..8387e877b 100644
--- a/src/app/api/user/export/route.ts
+++ b/src/app/api/user/export/route.ts
@@ -306,3 +306,5 @@ export async function GET(req: NextRequest) {
     },
   });
 }
+
+.catch(err => console.error("Promise.all failed:", err));
\ No newline at end of file