[NUI] Fix ICustomFocusAlgorithm exception (#1188)

[platform/core/csapi/tizenfx.git] / src / Tizen.NUI / src / public / FocusManager.cs

diff --git a/src/Tizen.NUI/src/public/FocusManager.cs b/src/Tizen.NUI/src/public/FocusManager.cs
index e6736af..f332366 100755 (executable)
--- a/src/Tizen.NUI/src/public/FocusManager.cs
+++ b/src/Tizen.NUI/src/public/FocusManager.cs
@@ -782,6 +782,11 @@ namespace Tizen.NUI
 
             public override View GetNextFocusableView(View current, View proposed, View.FocusDirection direction)
             {
+                if(_customFocusAlgorithm == null)
+                {
+                    Tizen.Log.Error("NUI", $"[ERROR] User defined ICustomFocusAlgorithm interface class becomes unreachable. Null will be proposed for next focusing!");
+                    return null;
+                }
                 return _customFocusAlgorithm.GetNextFocusableView(current, proposed, direction);
             }
         }