diff --git a/nxshell/src/app.rs b/nxshell/src/app.rs
index 5ee483e..1f5e5f5 100644
--- a/nxshell/src/app.rs
+++ b/nxshell/src/app.rs
@@ -20,12 +20,26 @@ pub struct NxShellOptions {
     pub show_add_session_modal: Rc<RefCell<bool>>,
     pub show_dock_panel: bool,
     pub multi_exec: bool,
+    /// Id of active tab
+    ///
+    /// Its main purpose is to preserve the state of egui::Response::contains_pointer().
+    /// Its functions :
+    ///
+    /// 1. When the mouse cursor leaves the terminal, it still influences the state of the current
+    ///    terminal's selection.
+    /// 2. When it is None, all tabs lose focus, and you can iteract with the other UI components.
     pub active_tab_id: Option<Id>,
     pub term_font: TerminalFont,
     pub term_font_size: f32,
     pub session_filter: String,
 }
 
+impl NxShellOptions {
+    pub fn surrender_focus(&mut self) {
+        self.active_tab_id = None;
+    }
+}
+
 impl Default for NxShellOptions {
     fn default() -> Self {
         let term_font_size = 14.;
@@ -130,13 +144,14 @@ impl eframe::App for NxShell {
         });
 
         if *self.opts.show_add_session_modal.borrow() {
+            self.opts.surrender_focus();
             self.show_add_session_window(ctx, &mut toasts);
-        } else {
-            egui::CentralPanel::default().show(ctx, |_ui| {
-                self.tab_view(ctx);
-            });
         }
 
+        egui::CentralPanel::default().show(ctx, |_ui| {
+            self.tab_view(ctx);
+        });
+
         toasts.show(ctx);
     }
 }
@@ -146,8 +161,7 @@ impl NxShell {
         let text_edit = TextEdit::singleline(&mut self.opts.session_filter);
         let response = ui.add(text_edit);
         if response.clicked() {
-            // gain ui focus
-            self.opts.active_tab_id = None;
+            self.opts.surrender_focus();
         } else if response.changed() {
             if let Ok(sessions) = self.db.find_sessions(&self.opts.session_filter) {
                 self.state_manager.sessions = Some(sessions);
diff --git a/nxshell/src/ui/form/session.rs b/nxshell/src/ui/form/session.rs
index c21e6d4..b86d45f 100644
--- a/nxshell/src/ui/form/session.rs
+++ b/nxshell/src/ui/form/session.rs
@@ -174,6 +174,17 @@ impl NxShell {
                 auth,
             },
         };
+
+        if self
+            .db
+            .find_session(&session.group, &session.name)?
+            .is_some()
+        {
+            return Err(NxError::Plain(
+                "`group` and `name` already exist, please choose another name.".to_string(),
+            ));
+        }
+
         self.add_shell_tab(ctx.clone(), typ)?;
 
         self.db.insert_session(Session {