Index: src/main/java/common/javax/swing/plaf/basic/BasicTableHeaderUI.java =================================================================== --- src/main/java/common/javax/swing/plaf/basic/BasicTableHeaderUI.java (revision 494856) +++ src/main/java/common/javax/swing/plaf/basic/BasicTableHeaderUI.java (working copy) @@ -206,7 +206,7 @@ } private void updateCursor(final MouseEvent e) { - if (e.getButton() > 0 || e.getModifiersEx() > 0) { + if (e == null || e.getButton() > 0 || e.getModifiersEx() > 0) { return; }