diff --git a/frontend/app/admin/appointments/page.tsx b/frontend/app/admin/appointments/page.tsx
index 475fb85..5ce2390 100644
--- a/frontend/app/admin/appointments/page.tsx
+++ b/frontend/app/admin/appointments/page.tsx
@@ -202,11 +202,7 @@ export default function AdminAppointmentsPage() {
       await fetchAppointments();
       setConfirmCancelId(null);
     } catch (err) {
-      if (err instanceof Error) {
-        setError(err.message);
-      } else {
-        setError("Failed to cancel appointment");
-      }
+      setError(err instanceof Error ? err.message : "Failed to cancel appointment");
     } finally {
       setCancellingId(null);
     }
diff --git a/frontend/app/appointments/page.tsx b/frontend/app/appointments/page.tsx
index ea13973..aa2f495 100644
--- a/frontend/app/appointments/page.tsx
+++ b/frontend/app/appointments/page.tsx
@@ -194,11 +194,7 @@ export default function AppointmentsPage() {
       await fetchAppointments();
       setConfirmCancelId(null);
     } catch (err) {
-      if (err instanceof Error) {
-        setError(err.message);
-      } else {
-        setError("Failed to cancel appointment");
-      }
+      setError(err instanceof Error ? err.message : "Failed to cancel appointment");
     } finally {
       setCancellingId(null);
     }
diff --git a/frontend/app/booking/page.tsx b/frontend/app/booking/page.tsx
index 13811a4..a387dce 100644
--- a/frontend/app/booking/page.tsx
+++ b/frontend/app/booking/page.tsx
@@ -302,11 +302,7 @@ export default function BookingPage() {
         await fetchSlots(selectedDate);
       }
     } catch (err) {
-      if (err instanceof Error) {
-        setError(err.message);
-      } else {
-        setError("Failed to book appointment");
-      }
+      setError(err instanceof Error ? err.message : "Failed to book appointment");
     } finally {
       setIsBooking(false);
     }