diff --git a/Assets/Scripts/Core/Stage.cs b/Assets/Scripts/Core/Stage.cs
index 006fd481..c241887e 100644
--- a/Assets/Scripts/Core/Stage.cs
+++ b/Assets/Scripts/Core/Stage.cs
@@ -917,7 +917,7 @@ void GetHitTarget()
 #endif
                 pos.y = Screen.height - pos.y;
                 TouchInfo touch = _touches[0];
-                if (pos.x < 0 || pos.y < 0) // outside of the window
+                if (float.IsNaN(pos.x) || float.IsNaN(pos.y) || float.pos.x < 0 || pos.y < 0) // outside of the window
                     _touchTarget = this;
                 else
                     _touchTarget = HitTest(pos, true);
@@ -1810,4 +1810,4 @@ public DisplayObject ClickTest()
             return obj;
         }
     }
-}
\ No newline at end of file
+}