diff --git a/back/volume/src/users/users.service.ts b/back/volume/src/users/users.service.ts
index 3ac5ea4..c8e617a 100644
--- a/back/volume/src/users/users.service.ts
+++ b/back/volume/src/users/users.service.ts
@@ -81,9 +81,24 @@ export class UsersService {
   }
 
   async invit (ftId: number, targetFtId: number) {
-    const user = await this.findUser(ftId)
+    const user = await this.usersRepository.findOne({
+      where: { ftId },
+      relations: {
+        followers: true,
+        friends: true,
+      }
+    })
     if (user == null) return null
-    const target = await this.findUser(targetFtId)
+    if (user.friends.findIndex(
+      (friend) => friend.ftId === targetFtId) != -1)
+      return null
+    const target = await this.usersRepository.findOne({
+      where: { ftId: targetFtId },
+      relations: {
+        followers: true,
+        friends: true,
+      }
+    })
     if (target == null) {
       return new NotFoundException(
         `Error: user id ${targetFtId} isn't in our db.`
@@ -97,7 +112,8 @@ export class UsersService {
         `Friend relation complete between ${user.username} and ${target.username}`
       )
       user.friends.push(target)
-      target.friends.push(user)
+      if (user != target)
+        target.friends.push(user)
       user.followers.slice(id, 1)
       this.usersRepository.save(user)
     } else {
diff --git a/front/volume/src/App.svelte b/front/volume/src/App.svelte
index 3731c9e..20cc86f 100644
--- a/front/volume/src/App.svelte
+++ b/front/volume/src/App.svelte
@@ -51,11 +51,15 @@
   export async function getFriends(): Promise<Friend[]> {
     let response = await fetch(API_URL + "/friends", {
       credentials: "include",
+      mode: "cors",
     });
     return await response.json();
   }
   export async function getInvits(): Promise<Friend[]> {
-    let response = await fetch(API_URL + "/invits", { credentials: "include" });
+    let response = await fetch(API_URL + "/invits", {
+      credentials: "include",
+      mode: "cors",
+    });
     return await response.json();
   }
 
diff --git a/front/volume/src/components/Friends.svelte b/front/volume/src/components/Friends.svelte
index 8472c9c..08a8b33 100644
--- a/front/volume/src/components/Friends.svelte
+++ b/front/volume/src/components/Friends.svelte
@@ -29,6 +29,7 @@
 
     response = await fetch(API_URL + "/invit/" + target.ftId, {
       credentials: "include",
+      mode: "cors",
     });
     if (response.ok) {
       console.log("Invitation send.");