NPE in FlatUIUtils.isCellEditor from getBorderInsets(null)

[johnmgithub]

I get a null pointer exception when using a combobox, though only after changing the LaF, strangely. The trace is:

java.lang.NullPointerException
	at com.formdev.flatlaf.ui.FlatUIUtils.isCellEditor(FlatUIUtils.java:226)
	at com.formdev.flatlaf.ui.FlatBorder.isCellEditor(FlatBorder.java:219)
	at com.formdev.flatlaf.ui.FlatBorder.getFocusWidth(FlatBorder.java:252)
	at com.formdev.flatlaf.ui.FlatBorder.getBorderInsets(FlatBorder.java:224)
	at javax.swing.border.AbstractBorder.getBorderInsets(AbstractBorder.java:75)
	at javax.swing.plaf.basic.BasicComboPopup.getPopupHeightForRowCount(BasicComboPopup.java:1241)
	at javax.swing.plaf.basic.BasicComboPopup.getPopupLocation(BasicComboPopup.java:1298)
	at javax.swing.plaf.basic.BasicComboPopup.show(BasicComboPopup.java:210)
	at javax.swing.plaf.basic.BasicComboPopup.togglePopup(BasicComboPopup.java:1170)
	at javax.swing.plaf.basic.BasicComboPopup$Handler.mousePressed(BasicComboPopup.java:858)

The problem seems to be that BasicComboPopup.getPopupHeightForRowCount calls border.getBorderInsets(null) and that null component gets passed down the chain until it causes an NPE in FlatUIUtils.isCellEditor where an attempt is made to getName() for the component.

[DevCharly]

Thx for reporting.

Was not able to reproduce this.
In my tests the scroller border was always null in BasicComboPopup.getPopupHeightForRowCount() and border.getBorderInsets(null) is never invoked.

Anyway added the null check to FlatUIUtils.isCellEditor()