diff --git a/src/graphics/ui/elements/InlineFrame.cpp b/src/graphics/ui/elements/InlineFrame.cpp
index 8699fd70b..acf00916e 100644
--- a/src/graphics/ui/elements/InlineFrame.cpp
+++ b/src/graphics/ui/elements/InlineFrame.cpp
@@ -35,8 +35,15 @@ void InlineFrame::setDocument(const std::shared_ptr<UiDocument>& document) {
 
     root->setSize(size);
 
-    gui.postRunnable([this]() {
-        scripting::on_ui_open(*this->document, {});
+    gui.postRunnable([weak = weak_from_this(), document]() {
+        auto node = weak.lock();
+        if (node == nullptr) {
+            return;
+        }
+        if (static_cast<InlineFrame&>(*node).document != document) {
+            return;
+        }
+        scripting::on_ui_open(*document, {});
     });
 }
 
diff --git a/src/graphics/ui/elements/SplitBox.cpp b/src/graphics/ui/elements/SplitBox.cpp
index 247ef7410..c35374529 100644
--- a/src/graphics/ui/elements/SplitBox.cpp
+++ b/src/graphics/ui/elements/SplitBox.cpp
@@ -82,6 +82,19 @@ void SplitBox::doubleClick(int x, int y) {
     refresh();
 }
 
+std::shared_ptr<UINode> SplitBox::getAt(const glm::vec2& pos) {
+    auto hover = Container::getAt(pos);
+    if (hover.get() != this) {
+        return hover;
+    }
+    for (const auto& node : nodes) {
+        if (node->isVisible() && node->isInside(pos)) {
+            return nullptr;
+        }
+    }
+    return hover;
+}
+
 void SplitBox::fullRefresh() {
     refresh();
     reposition();
diff --git a/src/graphics/ui/elements/SplitBox.hpp b/src/graphics/ui/elements/SplitBox.hpp
index 8482e73ec..1a452c2ff 100644
--- a/src/graphics/ui/elements/SplitBox.hpp
+++ b/src/graphics/ui/elements/SplitBox.hpp
@@ -11,6 +11,7 @@ namespace gui {
         virtual void refresh() override;
         virtual void fullRefresh() override;
         virtual void doubleClick(int x, int y) override;
+        virtual std::shared_ptr<UINode> getAt(const glm::vec2& pos) override;
     private:
         float splitPos;
     };
diff --git a/src/logic/scripting/scripting_functional.cpp b/src/logic/scripting/scripting_functional.cpp
index a6ef42a48..c71133ca8 100644
--- a/src/logic/scripting/scripting_functional.cpp
+++ b/src/logic/scripting/scripting_functional.cpp
@@ -99,14 +99,21 @@ template <typename T, T(tovalueFunc)(lua::State*, int)>
 std::function<T()> create_supplier(
     const scriptenv& env, const std::string& src, const std::string& file
 ) {
-    return [=]() {
+    return [=, errorLogged = false]() mutable {
+        lua::stackguard guard(lua::get_main_state());
         if (auto L = process_callback(env, src, file)) {
-            if (lua::isfunction(L, -1)) {
-                lua::call_nothrow(L, 0);
+            if (lua::isfunction(L, -1) && !lua::call_nothrow(L, 0)) {
+                return T {};
+            }
+            try {
+                return tovalueFunc(L, -1);
+            } catch (const std::exception& err) {
+                if (!errorLogged) {
+                    logger.error() << "supplier " << util::quote(src) << ": "
+                                   << err.what();
+                    errorLogged = true;
+                }
             }
-            auto str = tovalueFunc(L, -1);
-            lua::pop(L);
-            return str;
         }
         return T {};
     };
@@ -158,16 +165,33 @@ int_array_consumer scripting::create_int_array_consumer(
 vec2supplier scripting::create_vec2_supplier(
     const scriptenv& env, const std::string& src, const std::string& file
 ) {
-    return [=]() {
-        if (auto L = process_callback(env, src, file)) {
-            if (lua::isfunction(L, -1)) {
-                lua::call_nothrow(L, 0);
+    return [=, errorLogged = false]() mutable {
+        auto L = lua::get_main_state();
+        lua::stackguard guard(L);
+        int top = lua::gettop(L);
+        if (process_callback(env, src, file)) {
+            if (lua::isfunction(L, -1) && !lua::call_nothrow(L, 0)) {
+                return glm::vec2(0, 0);
+            }
+            if (lua::gettop(L) - top < 2) {
+                if (!errorLogged) {
+                    logger.error() << "supplier " << util::quote(src)
+                                   << ": two numbers expected";
+                    errorLogged = true;
+                }
+                return glm::vec2(0, 0);
+            }
+            try {
+                auto y = lua::tonumber(L, -1);
+                auto x = lua::tonumber(L, -2);
+                return glm::vec2(x, y);
+            } catch (const std::exception& err) {
+                if (!errorLogged) {
+                    logger.error() << "supplier " << util::quote(src) << ": "
+                                   << err.what();
+                    errorLogged = true;
+                }
             }
-            auto y = lua::tonumber(L, -1);
-            lua::pop(L);
-            auto x = lua::tonumber(L, -1);
-            lua::pop(L);
-            return glm::vec2(x, y);
         }
         return glm::vec2(0, 0);
     };