diff --git a/tools/simulator_base.cpp b/tools/simulator_base.cpp
index 9096ec0..dfa4600 100644
--- a/tools/simulator_base.cpp
+++ b/tools/simulator_base.cpp
@@ -11,8 +11,22 @@ std::string Simulator_base::name() const {
     return p_name;
 }
 
+bool Simulator_base::is_ui_id_unique(std::string id) const {
+    // Check if the UI name is unique
+    for (UI_item* item : p_UI_items) {
+        if (item->id() == id) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
 void Simulator_base::add_UI_item(UI_item* item) {
     // Add a UI item to the simulator
+    if (is_ui_id_unique(item->id()) == false) {
+        throw std::runtime_error("UI item id " + item->id() + " is not unique");
+    }
     p_UI_items_map[item->id()] = item;
     p_UI_items.push_back(item);
 }
diff --git a/tools/simulator_base.hpp b/tools/simulator_base.hpp
index b677024..a510f7a 100644
--- a/tools/simulator_base.hpp
+++ b/tools/simulator_base.hpp
@@ -10,6 +10,8 @@ class Simulator_base {
 
         std::string name() const;
 
+        bool is_ui_id_unique(std::string id) const;
+
         void add_UI_item(UI_item* item);
         json get_UI_items() const;