On Thu, 15 Oct 2020 23:24:54 GMT, Kevin Rushforth <[email protected]> wrote:

>> Ambarish Rapte has updated the pull request incrementally with one 
>> additional commit since the last revision:
>> 
>>   Review update
>
> modules/javafx.controls/src/main/java/javafx/scene/control/skin/TabPaneSkin.java
>  line 716:
> 
>> 714: 
>> 715:     private boolean isHorizontal() {
>> 716:         Side tabPosition = getSkinnable() != null ? 
>> getSkinnable().getSide() : Side.TOP;
> 
> I agree with @kleopatra This null check suggests that someone (a listener 
> perhaps?) is calling into the skin after it has been disposed.

The NPE here occurs if `tabHeaderArea` is not removed when disposing the skin.
Actually this NPE does not occur with commit#1 and the null check was not 
needed, It is removed now.
(The NPE can be observed by removing line#283 from TabPaneSkin.java of this fix)

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PR: https://git.openjdk.java.net/jfx/pull/318

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