diff --git a/res/scripts/stdlib.lua b/res/scripts/stdlib.lua
index 9ee20241..67cdd0fe 100644
--- a/res/scripts/stdlib.lua
+++ b/res/scripts/stdlib.lua
@@ -37,7 +37,10 @@ local function complete_app_lib(app)
     app.tick = coroutine.yield
     app.get_version = core.get_version
     app.get_setting_info = core.get_setting_info
-    app.load_content = core.load_content
+    app.load_content = function()
+        core.load_content()
+        app.tick()
+    end
     app.reset_content = core.reset_content
     app.is_content_loaded = core.is_content_loaded
     
@@ -416,7 +419,18 @@ end
 
 function start_coroutine(chunk, name)
     local co = coroutine.create(function()
-        local status, error = xpcall(chunk, __vc__error)
+        local status, error = xpcall(chunk, function(...)
+            gui.alert(debug.traceback(), function()
+                if world.is_open() then
+                    __vc_app.close_world()
+                else
+                    __vc_app.reset_content()
+                    menu:reset()
+                    menu.page = "main"
+                end
+            end)
+            return ...
+        end)
         if not status then
             debug.error(error)
         end
diff --git a/src/graphics/ui/gui_util.cpp b/src/graphics/ui/gui_util.cpp
index b84dcfd0..04026132 100644
--- a/src/graphics/ui/gui_util.cpp
+++ b/src/graphics/ui/gui_util.cpp
@@ -34,13 +34,14 @@ void guiutil::alert(
     auto panel = std::make_shared<Panel>(glm::vec2(500, 300), glm::vec4(4.0f), 4.0f);
     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]() {
-        menu->removePage("<alert>");
+    auto menuPtr = engine.getGUI()->getMenu();
+    auto& menu = *menuPtr;
+    runnable on_hidden_final = [on_hidden, &menu, &engine]() {
+        menu.removePage("<alert>");
         if (on_hidden) {
             on_hidden();
         } else {
-            menu->back();
+            menu.back();
         }
     };
     
@@ -50,21 +51,21 @@ void guiutil::alert(
     panel->add(label);
     panel->add(std::make_shared<Button>(
         langs::get(L"Ok"), glm::vec4(10.f), 
-        [=](GUI*) {
+        [on_hidden_final](GUI*) {
             on_hidden_final();
         }
     ));
     panel->refresh();
-    panel->keepAlive(Events::keyCallbacks[keycode::ENTER].add([=](){
+    panel->keepAlive(Events::keyCallbacks[keycode::ENTER].add([on_hidden_final](){
         on_hidden_final();
         return true;
     }));
-    panel->keepAlive(Events::keyCallbacks[keycode::ESCAPE].add([=](){
+    panel->keepAlive(Events::keyCallbacks[keycode::ESCAPE].add([on_hidden_final](){
         on_hidden_final();
         return true;
     }));
-    menu->addPage("<alert>", panel, true);
-    menu->setPage("<alert>");
+    menu.addPage("<alert>", panel, true);
+    menu.setPage("<alert>");
 }
 
 void guiutil::confirm(
diff --git a/src/logic/scripting/lua/lua_wrapper.hpp b/src/logic/scripting/lua/lua_wrapper.hpp
index 8637babc..417314cd 100644
--- a/src/logic/scripting/lua/lua_wrapper.hpp
+++ b/src/logic/scripting/lua/lua_wrapper.hpp
@@ -22,6 +22,9 @@ namespace lua {
 
     inline void pop(lua::State* L, int n = 1) {
 #ifndef NDEBUG
+        if (n < 0) {
+            abort();
+        }
         if (lua_gettop(L) < n) {
             abort();
         }
diff --git a/src/logic/scripting/scripting.cpp b/src/logic/scripting/scripting.cpp
index d9b15490..52eab4cd 100644
--- a/src/logic/scripting/scripting.cpp
+++ b/src/logic/scripting/scripting.cpp
@@ -86,7 +86,10 @@ public:
     }
     
     void update() override {
-        if (lua::getglobal(L, "__vc_resume_coroutine")) {
+        if (id == 0) {
+            return;
+        }
+        if (lua::requireglobal(L, "__vc_resume_coroutine")) {
             lua::pushinteger(L, id);
             if (lua::call(L, 1)) {
                 alive = lua::toboolean(L, -1);
@@ -102,10 +105,10 @@ public:
     }
     
     void terminate() override {
-        if (lua::getglobal(L, "__vc_stop_coroutine")) {
-            lua::pushinteger(L, id);
-            lua::pop(L, lua::call(L, 1));
-        }
+        lua::requireglobal(L, "__vc_stop_coroutine");
+        lua::pushinteger(L, id);
+        lua::pop(L, lua::call(L, 1));
+        id = 0;
     }
 };