Index: src/main/java/common/javax/swing/plaf/basic/BasicProgressBarUI.java =================================================================== --- src/main/java/common/javax/swing/plaf/basic/BasicProgressBarUI.java (revision 490282) +++ src/main/java/common/javax/swing/plaf/basic/BasicProgressBarUI.java (working copy) @@ -208,11 +208,15 @@ } protected void startAnimationTimer() { - animationTimer.start(); + if (animationTimer != null) { + animationTimer.start(); + } } protected void stopAnimationTimer() { - animationTimer.stop(); + if (animationTimer != null) { + animationTimer.stop(); + } } protected Dimension getPreferredInnerHorizontal() {