[Player] fix svace issue

Change-Id: Id7c99e2384549c30d703d7e041e7ea3eca7352f6

diff --git a/src/Tizen.Multimedia/Player/Player.cs b/src/Tizen.Multimedia/Player/Player.cs
index 00e3442..2274559 100755 (executable)
--- a/src/Tizen.Multimedia/Player/Player.cs
+++ b/src/Tizen.Multimedia/Player/Player.cs
@@ -350,9 +350,15 @@ namespace Tizen.Multimedia
 
         private void ReplaceDisplay(PlayerDisplay newDisplay)
         {
-            _display.Player = null;
+            if (_display != null)
+            {
+                _display.Player = null;
+            }
             _display = newDisplay;
-            _display.Player = this;
+            if (_display != null)
+            {
+                _display.Player = this;
+            }
         }
 
         /// <summary>