diff --git a/src/controllers/conversations_controller.rs b/src/controllers/conversations_controller.rs
index 666a19f..9b93de5 100644
--- a/src/controllers/conversations_controller.rs
+++ b/src/controllers/conversations_controller.rs
@@ -17,22 +17,19 @@ use crate::data::error::Res;
 use crate::data::http_request_handler::HttpRequestHandler;
 use crate::data::new_conversation::NewConversation;
 use crate::data::new_conversation_message::NewConversationMessage;
-use crate::data::user::UserID;
 use crate::data::user_ws_connection::UserWsConnection;
 use crate::data::user_ws_message::UserWsMessage;
-use crate::helpers::{conversations_helper, events_helper, user_helper};
+use crate::helpers::{conversations_helper, events_helper};
 use crate::helpers::events_helper::Event;
 use crate::routes::RequestResult;
 use crate::utils::string_utils::remove_html_nodes;
 use crate::utils::user_data_utils::{delete_user_data_file_if_exists, user_data_path};
+use std::collections::HashSet;
 
 /// Create a new conversation
 pub fn create(r: &mut HttpRequestHandler) -> RequestResult {
     let name = r.post_string("name")?;
-    let mut members = r.post_numbers_list("users", 1)?
-        .iter()
-        .map(|f| UserID::new(f.clone()))
-        .collect::<Vec<UserID>>();
+    let mut members = r.post_users_id("users")?;
 
     // Adapt name
     let name = match name.as_str() {
@@ -40,18 +37,8 @@ pub fn create(r: &mut HttpRequestHandler) -> RequestResult {
         s => Some(s.to_string())
     };
 
-    // Check if members exists
-    for user in &members {
-        if !user_helper::exists(user)? {
-            r.not_found(format!("User {} not found!", user.id()))?;
-        }
-    }
-
     // Add current user ID if required
-    let curr_user_id = r.user_id()?;
-    if !members.contains(&curr_user_id) {
-        members.push(curr_user_id);
-    }
+    members.insert(r.user_id()?);
 
     let conv = NewConversation {
         owner_id: r.user_id()?,
@@ -204,13 +191,17 @@ pub fn find_private(r: &mut HttpRequestHandler) -> RequestResult {
             return r.not_found(format!("Not any private conversation was found. The server was not allowed to create a new one..."));
         }
 
+        let mut members = HashSet::new();
+        members.insert(r.user_id()?);
+        members.insert(r.user_id()?);
+
         let new_conv = NewConversation {
             owner_id: r.user_id()?,
             name: None,
             owner_following: true,
-            members: vec![r.user_id()?, other_user],
+            members,
             can_everyone_add_members: true,
-            color: r.post_color_opt("color")?,
+            color: None,
             logo: None,
             group_id: None,
         };
diff --git a/src/data/new_conversation.rs b/src/data/new_conversation.rs
index bad0c1a..7175faa 100644
--- a/src/data/new_conversation.rs
+++ b/src/data/new_conversation.rs
@@ -2,8 +2,10 @@
 //!
 //! @author Pierre Huber
 
-use crate::data::user::UserID;
+use std::collections::HashSet;
+
 use crate::data::group_id::GroupID;
+use crate::data::user::UserID;
 
 #[derive(Debug)]
 pub struct NewConversation {
@@ -13,6 +15,6 @@ pub struct NewConversation {
     pub color: Option<String>,
     pub logo: Option<String>,
     pub owner_following: bool,
-    pub members: Vec<UserID>,
-    pub can_everyone_add_members: bool
+    pub members: HashSet<UserID>,
+    pub can_everyone_add_members: bool,
 }
\ No newline at end of file