java.lang.RuntimeException: java.lang.NullPointerException

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via GitHub by LeoLozes
, 1 year ago
java.lang.NullPointerException
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java.lang.NullPointerException
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java.lang.NullPointerException
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java.lang.NullPointerException
java.lang.RuntimeException: java.lang.NullPointerException
at javax.swing.SwingUtilities.getWindowAncestor(SwingUtilities.java:135)
at javax.swing.plaf.metal.MetalRootPaneUI.installWindowListeners(MetalRootPaneUI.java:220)

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