From 9bc656a5c5d5ed639940787e222c11db11076d49 Mon Sep 17 00:00:00 2001
From: Karl Tauber <karl@jformdesigner.com>
Date: Tue, 20 Oct 2020 10:37:31 +0200
Subject: [PATCH] TabbedPane: fixed NPE in scroll layout when removing last tab

---
 CHANGELOG.md                                               | 2 +-
 .../main/java/com/formdev/flatlaf/ui/FlatTabbedPaneUI.java | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index a0c58204..c38b53b7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,7 +16,7 @@ FlatLaf Change Log
 - TabbedPane: Support adding custom components to left and right sides of tabs
   area. (set client property `JTabbedPane.leadingComponent` or
   `JTabbedPane.trailingComponent` to a `java.awt.Component`) (issue #40)
-- TabbedPane: Support closable tabs. (issue #40)
+- TabbedPane: Support closable tabs. (issues #31 and #40)
 - Support painting separator line between window title and content (use UI value
   `TitlePane.borderColor`). (issue #184)
 
diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTabbedPaneUI.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTabbedPaneUI.java
index 79cba85f..7536883c 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTabbedPaneUI.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTabbedPaneUI.java
@@ -1844,6 +1844,13 @@ public class FlatTabbedPaneUI
 			if( !useMoreButton && (backwardButton == null || forwardButton == null) )
 				return; // should never occur
 
+			if( rects.length == 0 ) {
+				moreTabsButton.setVisible( false );
+				backwardButton.setVisible( false );
+				forwardButton.setVisible( false );
+				return;
+			}
+
 			Rectangle bounds = tabPane.getBounds();
 			Insets insets = tabPane.getInsets();
 			int tabPlacement = tabPane.getTabPlacement();