Why can't i Iterate?

The screenshot as it is works. If I instead try to iterate over the snakeParts list, it all goes to hell. (The commented code is used instead of calling each element over and over for that.) What am I doing wrong? Error Trace It's all Greek down here, but I think it's a NoSuchElement Exception. But why? Exception in Application start method Exception in thread "main" java.lang.reflect.InvocationTargetException at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1051) Caused by: java.lang.RuntimeException: Exception in Application start method at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:973) at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:198) at java.base/java.lang.Thread.run(Thread.java:834) Caused by: java.util.NoSuchElementException at java.base/java.util.ArrayList$Itr.next(ArrayList.java:999) at com.codegym.games.snake.Snake.draw(Snake.java:30) at com.codegym.games.snake.SnakeGame.drawScene(SnakeGame.java:23) at com.codegym.games.snake.SnakeGame.createGame(SnakeGame.java:28) at com.codegym.games.snake.SnakeGame.initialize(SnakeGame.java:14) at com.codegym.engine.cell.Game.start(Game.java:68) at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:919) at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$11(PlatformImpl.java:449) at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$9(PlatformImpl.java:418) at java.base/java.security.AccessController.doPrivileged(Native Method) at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:417) at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)