java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at sun.font.FontDesignMetrics$MetricsKey.init(FontDesignMetrics.java:217)
at sun.font.FontDesignMetrics.getMetrics(FontDesignMetrics.java:286)
at sun.swing.SwingUtilities2.getFontMetrics(SwingUtilities2.java:1113)
at javax.swing.JComponent.getFontMetrics(JComponent.java:1626)
at sun.swing.MenuItemLayoutHelper.reset(MenuItemLayoutHelper.java:126)
at javax.swing.plaf.synth.SynthMenuItemLayoutHelper.(SynthMenuItemLayoutHelper.java:119)
at javax.swing.plaf.synth.SynthGraphicsUtils.getPreferredMenuItemSize(SynthGraphicsUtils.java:437)
at javax.swing.plaf.synth.SynthMenuItemUI.getPreferredMenuItemSize(SynthMenuItemUI.java:216)
at javax.swing.plaf.basic.BasicMenuItemUI.getPreferredSize(BasicMenuItemUI.java:367)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1662)
at javax.swing.BoxLayout.checkRequests(BoxLayout.java:484)
at javax.swing.BoxLayout.preferredLayoutSize(BoxLayout.java:301)
at javax.swing.plaf.basic.DefaultMenuLayout.preferredLayoutSize(DefaultMenuLayout.java:60)
at javax.swing.plaf.synth.SynthMenuLayout.preferredLayoutSize(SynthMenuLayout.java:51)
at java.awt.Container.preferredSize(Container.java:1796)
at java.awt.Container.getPreferredSize(Container.java:1780)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1664)
at javax.swing.JMenu.getPopupMenuOrigin(JMenu.java:377)
at javax.swing.JMenu.setPopupMenuVisible(JMenu.java:343)
at javax.swing.JPopupMenu.menuSelectionChanged(JPopupMenu.java:1478)
at javax.swing.MenuSelectionManager.setSelectedPath(MenuSelectionManager.java:125)
at javax.swing.plaf.basic.BasicMenuUI.appendPath(BasicMenuUI.java:222)
at javax.swing.plaf.basic.BasicMenuUI.access$200(BasicMenuUI.java:49)
at javax.swing.plaf.basic.BasicMenuUI$Handler.mousePressed(BasicMenuUI.java:461)
at java.awt.Component.processMouseEvent(Component.java:6532)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6300)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4891)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4713)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4522)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2750)
at java.awt.Component.dispatchEvent(Component.java:4713)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at org.graffiti.editor.GlobalHotkeyManager.dispatchEvent(GlobalHotkeyManager.java:65)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

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