Makes sure m_CurrentSelection is valid before using it.

include/Engine/Editor/EditorSystem.h

@@ -47,6 +47,7 @@ private:
     // Utility functions
     EntityWrapper importEntity(EntityWrapper parent, boost::filesystem::path filePath);
     void setWidgetMode(EditorGUI::WidgetMode mode);
+    bool isAnyParentMissingTransform(EntityID entityID);
 
     // GUI callbacks
     void OnEntitySelected(EntityWrapper entity);

src/Engine/Editor/EditorSystem.cpp

@@ -72,6 +72,9 @@ void EditorSystem::Update(double dt)
         m_EditorStats->Draw(actualDelta);
 
         if (m_CurrentSelection.Valid() && m_Widget.Valid()) {
+            if (isAnyParentMissingTransform(m_CurrentSelection.ID)) {
+                return;
+            }
             (glm::vec3&)m_Widget["Transform"]["Position"] = Transform::AbsolutePosition(m_CurrentSelection);
             if (m_WidgetSpace == EditorGUI::WidgetSpace::Local) {
                 (glm::vec3&)m_Widget["Transform"]["Orientation"] = Transform::AbsoluteOrientationEuler(m_CurrentSelection);
@@ -79,7 +82,6 @@ void EditorSystem::Update(double dt)
                 (glm::vec3&)m_Widget["Transform"]["Orientation"] = glm::vec3(0, 0, 0);
             }
         }
-
         m_EditorWorldSystemPipeline->Update(actualDelta);
 
         ComponentWrapper& cameraTransform = m_EditorCamera["Transform"];
@@ -203,6 +205,9 @@ bool EditorSystem::OnMousePress(const Events::MousePress& e)
 bool EditorSystem::OnWidgetDelta(const Events::WidgetDelta& e)
 {
     if (m_CurrentSelection.Valid()) {
+        if (isAnyParentMissingTransform(m_CurrentSelection.ID)) {
+            return false;
+        }
         if (m_WidgetSpace == EditorGUI::WidgetSpace::Global) {
             glm::quat parentOrientation;
             glm::vec3 parentScale(1.f);
@@ -309,3 +314,15 @@ void EditorSystem::setWidgetMode(EditorGUI::WidgetMode mode)
 
     m_Widget["Transform"]["Position"] = Transform::AbsolutePosition(m_CurrentSelection.World, m_CurrentSelection.ID);
 }
+
+bool EditorSystem::isAnyParentMissingTransform(EntityID entityID)
+{
+    EntityWrapper entity(m_World, entityID);
+    while (entity.Parent().Valid()) {
+        if (!entity.HasComponent("Transform")) {
+            return true;
+        }
+        entity = entity.Parent();
+    }
+    return false;
+}