diff --git a/apps/web/src/app/tournament/[id]/create/_hooks/usePostTournamentStart.ts b/apps/web/src/app/tournament/[id]/create/_hooks/usePostTournamentStart.ts
index a1b522b6..b9c0cb50 100644
--- a/apps/web/src/app/tournament/[id]/create/_hooks/usePostTournamentStart.ts
+++ b/apps/web/src/app/tournament/[id]/create/_hooks/usePostTournamentStart.ts
@@ -1,9 +1,13 @@
 import { useMutation } from '@tanstack/react-query';
+import { isAxiosError } from 'axios';
 import { useRouter } from 'next/navigation';
+import { toast } from 'sonner';
 
 import { ANALYTICS_EVENT } from '@/consts/analytics';
 import { ROUTES } from '@/consts/route';
+import type { ApiErrorResponseT } from '@/types/api';
 import { logAnalyticsEvent } from '@/utils/analytics';
+import { getApiErrorMessage } from '@/utils/getApiErrorMessage';
 
 import { postTournamentStart } from '../_apis/postTournamentStart';
 
@@ -23,6 +27,20 @@ export const usePostTournamentStart = (tournamentId: number) => {
         });
         router.push(ROUTES.TOURNAMENT_LOADING(nextTournamentId));
       },
+      onError: error => {
+        if (!isAxiosError<ApiErrorResponseT>(error) || !error.response) return;
+
+        const { status } = error.response;
+
+        if (status === 409) {
+          router.push(ROUTES.TOURNAMENT_MATCH(tournamentId));
+          return;
+        }
+
+        if (status < 500) {
+          toast.error(getApiErrorMessage(error));
+        }
+      },
     });
 
   return { postTournamentStartMutation, isPostTournamentStartPending };