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

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java.lang.NullPointerException:
at javax.swing.text.html.CSS$FontSize.getValue(Unknown Source)
at javax.swing.text.html.CSS$FontSize.toStyleConstants(Unknown Source)
at javax.swing.text.html.StyleSheet$ViewAttributeSet.getAttribute(Unknown Source)
at javax.swing.text.StyleConstants.getFontSize(Unknown Source)
at javax.swing.text.html.CSS$FontSize.getValue(Unknown Source)
at javax.swing.text.html.CSS$FontSize.toStyleConstants(Unknown Source)
at javax.swing.text.html.StyleSheet$ViewAttributeSet.getAttribute(Unknown Source)
at javax.swing.text.StyleConstants.getFontSize(Unknown Source)
at javax.swing.text.html.CSS$FontSize.getValue(Unknown Source)
at javax.swing.text.html.CSS.getFontSize(Unknown Source)
at javax.swing.text.html.CSS.getFont(Unknown Source)
at javax.swing.text.html.StyleSheet.getFont(Unknown Source)
at javax.swing.text.DefaultStyledDocument.getFont(Unknown Source)
at javax.swing.text.LabelView.setPropertiesFromAttributes(Unknown Source)
at javax.swing.text.html.InlineView.setPropertiesFromAttributes(Unknown Source)
at javax.swing.text.LabelView.sync(Unknown Source)
at javax.swing.text.LabelView.getFont(Unknown Source)
at javax.swing.text.GlyphPainter1.sync(Unknown Source)
at javax.swing.text.GlyphPainter1.getSpan(Unknown Source)
at javax.swing.text.GlyphView.getPreferredSpan(Unknown Source)
at javax.swing.text.FlowView$LogicalView.getPreferredSpan(Unknown Source)
at javax.swing.text.FlowView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.html.ParagraphView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.BoxView.checkRequests(Unknown Source)
at javax.swing.text.BoxView.getMinimumSpan(Unknown Source)
at javax.swing.text.html.ParagraphView.getMinimumSpan(Unknown Source)
at javax.swing.text.BoxView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.html.BlockView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.BoxView.checkRequests(Unknown Source)
at javax.swing.text.BoxView.getMinimumSpan(Unknown Source)
at javax.swing.text.html.BlockView.getMinimumSpan(Unknown Source)
at javax.swing.text.BoxView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.html.BlockView.calculateMinorAxisRequirements(Unknown Source)
at javax.swing.text.BoxView.checkRequests(Unknown Source)
at javax.swing.text.BoxView.setSpanOnAxis(Unknown Source)
at javax.swing.text.BoxView.layout(Unknown Source)
at javax.swing.text.BoxView.setSize(Unknown Source)
at javax.swing.plaf.basic.BasicTextUI$RootView.setSize(Unknown Source)
at javax.swing.plaf.basic.BasicTextUI$RootView.paint(Unknown Source)
at javax.swing.plaf.basic.BasicTextUI.paintSafely(Unknown Source)
at javax.swing.plaf.basic.BasicTextUI.paint(Unknown Source)
at javax.swing.plaf.basic.BasicTextUI.update(Unknown Source)
at javax.swing.JComponent.paintComponent(Unknown Source)
at javax.swing.JComponent.paint(Unknown Source)
at javax.swing.JComponent.paintWithOffscreenBuffer(Unknown Source)

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