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

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java.lang.NullPointerException:
at com.googlecode.lanterna.gui2.WindowShadowRenderer.postRender(WindowShadowRenderer.java:51)
at com.googlecode.lanterna.gui2.MultiWindowTextGUI.drawGUI(MultiWindowTextGUI.java:271)
at com.googlecode.lanterna.gui2.AbstractTextGUI.updateScreen(AbstractTextGUI.java:120)
at com.googlecode.lanterna.gui2.MultiWindowTextGUI.updateScreen(MultiWindowTextGUI.java:219)
at com.googlecode.lanterna.gui2.AbstractTextGUIThread.processEventsAndUpdate(AbstractTextGUIThread.java:83)
at com.googlecode.lanterna.gui2.MultiWindowTextGUI.waitForWindowToClose(MultiWindowTextGUI.java:401)
at com.googlecode.lanterna.gui2.AbstractWindow.waitUntilClosed(AbstractWindow.java:268)
at com.googlecode.lanterna.gui2.MultiWindowTextGUI.addWindowAndWait(MultiWindowTextGUI.java:368)
at org.celyo.jdbconsole.MainApp.main(MainApp.java:52)

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