[NUI] Add null check in Process (#2859)

add null check

Signed-off-by: huiyu.eun <huiyu.eun@samsung.com>

diff --git a/src/Tizen.NUI/src/internal/Layouting/LayoutController.cs b/src/Tizen.NUI/src/internal/Layouting/LayoutController.cs
index 3e89549..52127da 100755 (executable)
--- a/src/Tizen.NUI/src/internal/Layouting/LayoutController.cs
+++ b/src/Tizen.NUI/src/internal/Layouting/LayoutController.cs
@@ -249,7 +249,10 @@ namespace Tizen.NUI
             {
                 layer?.Children?.ForEach(view =>
                 {
-                    FindRootLayouts(view, width, height);
+                    if (view != null)
+                    {
+                        FindRootLayouts(view, width, height);
+                    }
                 });
             });
             windowSize.Dispose();