Exception in thread "Thread-11" java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
at java.util.ArrayList$Itr.next(ArrayList.java:851)
at com.sun.media.jfxmediaimpl.NativeMediaManager.addMediaErrorListener(NativeMediaManager.java:309)
at com.sun.media.jfxmedia.MediaManager.addMediaErrorListener(MediaManager.java:133)
at javafx.scene.media.MediaPlayer.<init>(MediaPlayer.java:403)
at controllers.menus.MenuController.lambda$keyHandler$4(**_MenuController.java:117_**)
at java.lang.Thread.run(Thread.java:745)
