Check parent path isn't null. Fixes #203

core/src/main/java/com/github/weisj/darklaf/ui/cell/hint/CellHintPopupListener.java

@@ -115,9 +115,6 @@ public class CellHintPopupListener<T extends JComponent, I> extends MouseInputAd
                         cellBounds.y = rect.y - cellBounds.y;
                         rect.x += popupLocation.x;
                         rect.y += popupLocation.y;
-                        System.out.println("Allocation " + allocation);
-                        System.out.println("CellBounds " + cellBounds);
-                        System.out.println("PreffeSize " + prefSize);
                         enter(index, rect, cellBounds);
                         return;
                     } else {

core/src/main/java/com/github/weisj/darklaf/ui/tree/DarkTreeUI.java

@@ -600,7 +600,9 @@ public class DarkTreeUI extends BasicTreeUI implements PropertyChangeListener, C
         if (p == null) return false;
         if (Objects.equals(p, path)) return true;
         if (tree.isExpanded(p)) return false;
-        return Objects.equals(p.getParentPath().getLastPathComponent(), path.getLastPathComponent());
+        TreePath parent = p.getParentPath();
+        if (parent == null) return false;
+        return Objects.equals(parent.getLastPathComponent(), path.getLastPathComponent());
     }
 
     protected boolean isDashedLine() {