This is related to dragging files into the small file section:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException: Cannot invoke "javax.swing.tree.TreeCellRenderer.getTreeCellRendererComponent(javax.swing.JTree, Object, boolean, boolean, boolean, int, boolean)" because "renderer" is null
at com.github.weisj.darklaf.ui.tree.TreeCellContainer.getCellRendererComponent(TreeCellContainer.java:75)
at com.github.weisj.darklaf.ui.tree.TreeCellContainer.getCellRendererComponent(TreeCellContainer.java:32)
at com.github.weisj.darklaf.ui.cell.hint.IndexedCellContainer.getEffectiveCellRendererComponent(IndexedCellContainer.java:45)
at com.github.weisj.darklaf.ui.cell.hint.CellHintPopupListener.getRenderer(CellHintPopupListener.java:326)
at com.github.weisj.darklaf.ui.cell.hint.CellHintPopupListener.access$100(CellHintPopupListener.java:39)
at com.github.weisj.darklaf.ui.cell.hint.CellHintPopupListener$PopupComponent.paint(CellHintPopupListener.java:393)
at java.desktop/javax.swing.JComponent.paintChildren(JComponent.java:952)
at java.desktop/javax.swing.JComponent.paint(JComponent.java:1128)
at java.desktop/javax.swing.JComponent.paintChildren(JComponent.java:952)
at java.desktop/javax.swing.JComponent.paint(JComponent.java:1128)
at java.desktop/javax.swing.JLayeredPane.paint(JLayeredPane.java:586)
at java.desktop/javax.swing.JComponent.paintChildren(JComponent.java:952)
at java.desktop/javax.swing.JComponent.paintToOffscreen(JComponent.java:5318)
at java.desktop/javax.swing.RepaintManager$PaintManager.paintDoubleBufferedFPScales(RepaintManager.java:1721)
at java.desktop/javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1630)
at java.desktop/javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1570)
at java.desktop/javax.swing.RepaintManager.paint(RepaintManager.java:1337)
at java.desktop/javax.swing.JComponent.paint(JComponent.java:1105)
at java.desktop/java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:39)
at java.desktop/sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:75)
at java.desktop/sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:112)
at java.desktop/java.awt.Container.paint(Container.java:2005)
at java.desktop/javax.swing.RepaintManager$4.run(RepaintManager.java:890)
at java.desktop/javax.swing.RepaintManager$4.run(RepaintManager.java:862)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.desktop/javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:862)
at java.desktop/javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:835)
at java.desktop/javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:784)
at java.desktop/javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1898)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:771)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:722)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:716)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:741)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
This is related to dragging files into the small file section: