Make sure the blocks are in the canvas.

Plugins/Nautilus.Game.Arcade/src/nautilus/game/arcade/game/games/draw/Draw.java

@@ -826,6 +826,12 @@ public class Draw extends SoloGame
 					continue blocks;
 				}
 
+				if (!_canvas.contains(other))
+				{
+					// Block isn't in the canvas.
+					continue blocks;
+				}
+
 				// Add it to the pending list for change later.
 				pending.add(other);
 			}