[NUI] Fix null pointer svace issue

diff --git a/src/Tizen.NUI/src/public/XamlBinding/Element.cs b/src/Tizen.NUI/src/public/XamlBinding/Element.cs
index ea7c48a..18a0ea0 100755 (executable)
--- a/src/Tizen.NUI/src/public/XamlBinding/Element.cs
+++ b/src/Tizen.NUI/src/public/XamlBinding/Element.cs
@@ -200,9 +200,9 @@ namespace Tizen.NUI.Binding
                 if (RealParent != null)
                     ((IElement)RealParent).RemoveResourcesChangedListener(OnParentResourcesChanged);
                 RealParent = value;
-                if (RealParent != null)
+                if (RealParent != null && RealParent.GetMergedResources() != null)
                 {
-                    OnParentResourcesChanged(RealParent?.GetMergedResources());
+                    OnParentResourcesChanged(RealParent.GetMergedResources());
                     ((IElement)RealParent).AddResourcesChangedListener(OnParentResourcesChanged);
                 }