diff --git a/src/app/admin/tournaments/[id]/edit/page.tsx b/src/app/admin/tournaments/[id]/edit/page.tsx
index 543f6e4..82461a2 100644
--- a/src/app/admin/tournaments/[id]/edit/page.tsx
+++ b/src/app/admin/tournaments/[id]/edit/page.tsx
@@ -12,7 +12,11 @@ interface PageProps {
 }
 
 export default async function EditTournamentPage({ params }: PageProps) {
-  const tournamentId = parseInt(params.id)
+  const tournamentId = parseInt(params.id, 10)
+  
+  if (isNaN(tournamentId)) {
+    notFound()
+  }
   
   // Check if user can manage this tournament
   const permission = await canManageTournament(tournamentId)
diff --git a/src/app/admin/tournaments/[id]/page.tsx b/src/app/admin/tournaments/[id]/page.tsx
index 6c02516..f037076 100644
--- a/src/app/admin/tournaments/[id]/page.tsx
+++ b/src/app/admin/tournaments/[id]/page.tsx
@@ -13,7 +13,11 @@ interface PageProps {
 }
 
 export default async function TournamentDetailPage({ params }: PageProps) {
-  const tournamentId = parseInt(params.id)
+  const tournamentId = parseInt(params.id, 10)
+  
+  if (isNaN(tournamentId)) {
+    notFound()
+  }
   
   // Check if user can manage this tournament
   const permission = await canManageTournament(tournamentId)
diff --git a/src/app/admin/tournaments/[id]/results/page.tsx b/src/app/admin/tournaments/[id]/results/page.tsx
index 9c48506..a22b657 100644
--- a/src/app/admin/tournaments/[id]/results/page.tsx
+++ b/src/app/admin/tournaments/[id]/results/page.tsx
@@ -12,7 +12,11 @@ interface PageProps {
 }
 
 export default async function TournamentResultsPage({ params }: PageProps) {
-  const tournamentId = parseInt(params.id)
+  const tournamentId = parseInt(params.id, 10)
+  
+  if (isNaN(tournamentId)) {
+    notFound()
+  }
   
   // Check if user can manage this tournament
   const permission = await canManageTournament(tournamentId)