Merge branch 'crash_temporary_ui_element' into 'master'

Fix crash #7469

See merge request OpenMW/openmw!3367

components/lua_ui/element.cpp

@@ -216,12 +216,13 @@ namespace LuaUi
 
     void Element::destroy()
     {
+        if (mRoot)
+        {
+            destroyWidget(mRoot);
+            mRoot = nullptr;
+            mLayout = sol::make_object(mLayout.lua_state(), sol::nil);
+        }
         sAllElements.erase(this);
-        if (!mRoot)
-            return;
-        destroyWidget(mRoot);
-        mRoot = nullptr;
-        mLayout = sol::make_object(mLayout.lua_state(), sol::nil);
     }
 
     void Element::attachToWidget(WidgetExtension* w)