diff --git a/src/frontend/menu.cpp b/src/frontend/menu.cpp
index 1e279ae4..12283bea 100644
--- a/src/frontend/menu.cpp
+++ b/src/frontend/menu.cpp
@@ -86,25 +86,25 @@ bool menus::call(Engine& engine, runnable func) {
         engine.setScreen(std::make_shared<MenuScreen>(engine));
         // could not to find or read pack
         guiutil::alert(
-            gui->getMenu(), langs::get(L"error.pack-not-found")+L": "+
+            engine, langs::get(L"error.pack-not-found")+L": "+
             util::str2wstr_utf8(error.getPackId())
         );
         return false;
     } catch (const assetload::error& error) {
         engine.setScreen(std::make_shared<MenuScreen>(engine));
         guiutil::alert(
-            gui->getMenu(), langs::get(L"Assets Load Error", L"menu")+L":\n"+
+            engine, langs::get(L"Assets Load Error", L"menu")+L":\n"+
             util::str2wstr_utf8(error.what())
         );
         return false;
     } catch (const parsing_error& error) {
         engine.setScreen(std::make_shared<MenuScreen>(engine));
-        guiutil::alert(gui->getMenu(), util::str2wstr_utf8(error.errorLog()));
+        guiutil::alert(engine, util::str2wstr_utf8(error.errorLog()));
         return false;
     } catch (const std::runtime_error& error) {
         engine.setScreen(std::make_shared<MenuScreen>(engine));
         guiutil::alert(
-            gui->getMenu(), langs::get(L"Content Error", L"menu")+L":\n"+
+            engine, langs::get(L"Content Error", L"menu")+L":\n"+
             util::str2wstr_utf8(error.what())
         );
         return false;
diff --git a/src/graphics/ui/gui_util.cpp b/src/graphics/ui/gui_util.cpp
index 84c5934a..a94c3a94 100644
--- a/src/graphics/ui/gui_util.cpp
+++ b/src/graphics/ui/gui_util.cpp
@@ -27,12 +27,22 @@ std::shared_ptr<gui::UINode> guiutil::create(const std::string& source, scripten
 }
 
 void guiutil::alert(
-    const std::shared_ptr<gui::Menu>& menu,
+    Engine& engine,
     const std::wstring& text,
     const runnable& on_hidden
 ) {
     auto panel = std::make_shared<Panel>(glm::vec2(500, 300), glm::vec4(8.0f), 8.0f);
     panel->setColor(glm::vec4(0.0f, 0.0f, 0.0f, 0.5f));
+
+    auto menu = engine.getGUI()->getMenu();
+    runnable on_hidden_final = [on_hidden, menu, &engine]() {
+        if (on_hidden) {
+            on_hidden();
+        } else {
+            menu->back();
+        }
+        menu->removePage("<alert>");
+    };
     
     auto label = std::make_shared<Label>(text);
     label->setMultiline(true);
@@ -41,13 +51,18 @@ void guiutil::alert(
     panel->add(std::make_shared<Button>(
         langs::get(L"Ok"), glm::vec4(10.f), 
         [=](GUI*) {
-            if (on_hidden) {
-                on_hidden();
-            }
-            menu->back();
+            on_hidden_final();
         }
     ));
     panel->refresh();
+    panel->keepAlive(Events::keyCallbacks[keycode::ENTER].add([=](){
+        on_hidden_final();
+        return true;
+    }));
+    panel->keepAlive(Events::keyCallbacks[keycode::ESCAPE].add([=](){
+        on_hidden_final();
+        return true;
+    }));
     menu->addPage("<alert>", panel);
     menu->setPage("<alert>");
 }
@@ -74,21 +89,19 @@ void guiutil::confirm(
     runnable on_confirm_final = [on_confirm, menu, &engine]() {
         if (on_confirm) {
             on_confirm();
+        } else {
+            menu->back();
         }
-        menu->back();
-        engine.postRunnable([menu]() {
-            menu->removePage("<confirm>");
-        });
+        menu->removePage("<confirm>");
     };
 
     runnable on_deny_final = [on_deny, menu, &engine]() {
         if (on_deny) {
             on_deny();
+        } else {
+            menu->back();
         }
-        menu->back();
-        engine.postRunnable([menu]() {
-            menu->removePage("<confirm>");
-        });
+        menu->removePage("<confirm>");
     };
 
     subpanel->add(std::make_shared<Button>(yestext, glm::vec4(8.f), [=](GUI*){
diff --git a/src/graphics/ui/gui_util.hpp b/src/graphics/ui/gui_util.hpp
index d4a165a3..c52c57d6 100644
--- a/src/graphics/ui/gui_util.hpp
+++ b/src/graphics/ui/gui_util.hpp
@@ -15,7 +15,7 @@ namespace guiutil {
     std::shared_ptr<gui::UINode> create(const std::string& source, scriptenv env=0);
 
     void alert(
-        const std::shared_ptr<gui::Menu>& menu,
+        Engine& engine,
         const std::wstring& text, 
         const runnable& on_hidden=nullptr
     );
diff --git a/src/logic/EngineController.cpp b/src/logic/EngineController.cpp
index e54f5917..e98e0dae 100644
--- a/src/logic/EngineController.cpp
+++ b/src/logic/EngineController.cpp
@@ -151,7 +151,7 @@ static void load_world(
         engine.onWorldOpen(std::move(level));
     } catch (const world_load_error& error) {
         guiutil::alert(
-            engine.getGUI()->getMenu(),
+            engine,
             langs::get(L"Error") + L": " + util::str2wstr_utf8(error.what())
         );
         return;
diff --git a/src/logic/scripting/lua/libs/libgui.cpp b/src/logic/scripting/lua/libs/libgui.cpp
index 8f8b2f3a..f52110dc 100644
--- a/src/logic/scripting/lua/libs/libgui.cpp
+++ b/src/logic/scripting/lua/libs/libgui.cpp
@@ -780,6 +780,17 @@ static int l_gui_confirm(lua::State* L) {
     return 0;
 }
 
+static int l_gui_alert(lua::State* L) {
+    auto message = lua::require_wstring(L, 1);
+    runnable onconfirm = nullptr;
+    if (lua::gettop(L) >= 2) {
+        lua::pushvalue(L, 2);
+        onconfirm = lua::create_runnable(L);
+    }
+    guiutil::alert(*engine, message, onconfirm);
+    return 0;
+}
+
 const luaL_Reg guilib[] = {
     {"get_viewport", lua::wrap<l_gui_getviewport>},
     {"getattr", lua::wrap<l_gui_getattr>},
@@ -790,6 +801,7 @@ const luaL_Reg guilib[] = {
     {"clear_markup", lua::wrap<l_gui_clear_markup>},
     {"escape_markup", lua::wrap<l_gui_escape_markup>},
     {"confirm", lua::wrap<l_gui_confirm>},
+    {"alert", lua::wrap<l_gui_alert>},
     {"__reindex", lua::wrap<l_gui_reindex>},
     {NULL, NULL}
 };
diff --git a/src/logic/scripting/lua/lua_util.cpp b/src/logic/scripting/lua/lua_util.cpp
index bf4f4d4d..cdccc12a 100644
--- a/src/logic/scripting/lua/lua_util.cpp
+++ b/src/logic/scripting/lua/lua_util.cpp
@@ -241,8 +241,9 @@ runnable lua::create_runnable(State* L) {
     return [=]() {
         getglobal(L, LAMBDAS_TABLE);
         getfield(L, *funcptr);
-        call_nothrow(L, 0);
-        pop(L);
+        if (call_nothrow(L, 0)) {
+            pop(L);
+        }
     };
 }
 
@@ -253,10 +254,9 @@ supplier<bool> lua::create_simple_handler(State* L) {
         getfield(L, *funcptr);
         if (call_nothrow(L, 0)) {
             bool result = toboolean(L, -1);
-            pop(L, 2);
+            pop(L);
             return result;
         } else {
-            pop(L);
             return false;
         }
     };
diff --git a/src/util/HandlersList.hpp b/src/util/HandlersList.hpp
index 3f33ca0c..5af5250d 100644
--- a/src/util/HandlersList.hpp
+++ b/src/util/HandlersList.hpp
@@ -12,7 +12,7 @@ namespace util {
         int nextid = 1;
         std::unordered_map<int, std::function<bool(Types...)>> handlers;
         std::vector<int> order;
-        std::mutex mutex;
+        std::recursive_mutex mutex;
     public:
         HandlersList() = default;
 
@@ -45,7 +45,9 @@ namespace util {
 
         void notify(Types...args) {
             std::lock_guard lock(mutex);
-            for (auto it = order.rbegin(); it != order.rend(); ++it) {
+            
+            auto orderCopy = order;
+            for (auto it = orderCopy.rbegin(); it != orderCopy.rend(); ++it) {
                 if (handlers.at(*it)(args...)) {
                     break;
                 }