diff --git a/app/api/users/[userId]/route.ts b/app/api/users/[userId]/route.ts
index 38fc6da2..7758918c 100644
--- a/app/api/users/[userId]/route.ts
+++ b/app/api/users/[userId]/route.ts
@@ -125,6 +125,7 @@ export async function DELETE(
   { params }: { params: { userId: string } }
 ) {
   const session = await getServerSession(authOptions);
+  const userId = params.userId; // Store userId from params to avoid sync access issues
 
   if (!session) {
     return NextResponse.json({ error: "Non autorisé" }, { status: 401 });
@@ -155,7 +156,7 @@ export async function DELETE(
 
     // Get user details before deletion
     const userResponse = await fetch(
-      `${process.env.KEYCLOAK_BASE_URL}/admin/realms/${process.env.KEYCLOAK_REALM}/users/${params.userId}`,
+      `${process.env.KEYCLOAK_BASE_URL}/admin/realms/${process.env.KEYCLOAK_REALM}/users/${userId}`,
       {
         headers: {
           Authorization: `Bearer ${tokenData.access_token}`,
@@ -172,12 +173,12 @@ export async function DELETE(
     }
 
     const userDetails = await userResponse.json();
-    console.log('Processing user deletion for ID:', params.userId);
+    console.log('Processing user deletion for ID:', userId);
     
     // Forward the request to the new endpoint format with the email parameter
     // This ensures Dolibarr deletion is also handled
     const apiUrl = new URL(`${req.headers.get('origin') || process.env.NEXTAUTH_URL}/api/users`);
-    apiUrl.searchParams.append('id', params.userId);
+    apiUrl.searchParams.append('id', userId);
     apiUrl.searchParams.append('email', userDetails.email);
     
     const forwardResponse = await fetch(apiUrl.toString(), {
diff --git a/app/api/users/route.ts b/app/api/users/route.ts
index 06947784..475c5f2f 100644
--- a/app/api/users/route.ts
+++ b/app/api/users/route.ts
@@ -545,9 +545,68 @@ export async function POST(req: Request) {
   }
 }
 
+// Helper function to get Leantime user ID by email
+async function getLeantimeUserId(email: string): Promise<number | null> {
+  try {
+    // Validate email format
+    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
+    if (!emailRegex.test(email)) {
+      console.error('Invalid email format');
+      return null;
+    }
+
+    // Get user by email using the proper method
+    const userResponse = await fetch('https://agilite.slm-lab.net/api/jsonrpc', {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+        'X-API-Key': process.env.LEANTIME_TOKEN || '',
+      },
+      body: JSON.stringify({
+        method: 'leantime.rpc.Users.Users.getUserByEmail',
+        jsonrpc: '2.0',
+        id: 1,
+        params: {
+          email: email
+        }
+      })
+    });
+
+    const userData = await userResponse.json();
+    
+    console.log('Leantime user lookup response status:', userResponse.status);
+
+    if (!userResponse.ok || !userData.result) {
+      console.error('Failed to get Leantime user');
+      return null;
+    }
+
+    // The result should be the user object or false
+    if (userData.result === false) {
+      return null;
+    }
+
+    return userData.result.id;
+  } catch (error) {
+    console.error('Error getting Leantime user');
+    return null;
+  }
+}
+
 // Helper function to delete user from Leantime
 async function deleteLeantimeUser(email: string): Promise<{ success: boolean; error?: string }> {
   try {
+    // First get the Leantime user ID
+    const leantimeUserId = await getLeantimeUserId(email);
+    if (!leantimeUserId) {
+      return { 
+        success: false, 
+        error: 'User not found in Leantime' 
+      };
+    }
+
+    console.log(`Found Leantime user with ID: ${leantimeUserId}, proceeding with deletion`);
+
     const response = await fetch('https://agilite.slm-lab.net/api/jsonrpc', {
       method: 'POST',
       headers: {
@@ -559,7 +618,7 @@ async function deleteLeantimeUser(email: string): Promise<{ success: boolean; er
         jsonrpc: '2.0',
         id: 1,
         params: {
-          email: email
+          id: leantimeUserId
         }
       })
     });