diff --git a/apps/openmw/mwgui/windowmanagerimp.cpp b/apps/openmw/mwgui/windowmanagerimp.cpp
index 2c1741977c..4ff297dd94 100644
--- a/apps/openmw/mwgui/windowmanagerimp.cpp
+++ b/apps/openmw/mwgui/windowmanagerimp.cpp
@@ -2408,7 +2408,10 @@ namespace MWGui
 
     bool WindowManager::isWindowVisible(std::string_view windowId) const
     {
-        return mLuaIdToWindow.at(windowId)->isVisible();
+        auto it = mLuaIdToWindow.find(windowId);
+        if (it == mLuaIdToWindow.end())
+            throw std::logic_error("Invalid window name: " + std::string(windowId));
+        return it->second->isVisible();
     }
 
     std::vector<std::string_view> WindowManager::getAllWindowIds() const