From 2ae9bb381dbec9508bd4bbebfe223425ce5f7119 Mon Sep 17 00:00:00 2001
From: Karl Tauber <karl@jformdesigner.com>
Date: Mon, 14 Mar 2022 00:23:53 +0100
Subject: [PATCH] Menus: fixed `IllegalComponentStateException: component must
 be showing on the screen to determine its location` when submenu is empty (PR
 #490; issue #247)

---
 .../java/com/formdev/flatlaf/SubMenuUsabilityHelper.java  | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/SubMenuUsabilityHelper.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/SubMenuUsabilityHelper.java
index 19958f4f..157e8a94 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/SubMenuUsabilityHelper.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/SubMenuUsabilityHelper.java
@@ -130,8 +130,14 @@ debug*/
 		mouseX = mouseLocation.x;
 		mouseY = mouseLocation.y;
 
-		// get invoker screen bounds
+		// check whether popup is showing, which is e.g. not the case if it is empty
 		JPopupMenu popup = (JPopupMenu) path[subMenuIndex];
+		if( !popup.isShowing() ) {
+			uninstallEventQueue();
+			return;
+		}
+
+		// get invoker screen bounds
 		Component invoker = popup.getInvoker();
 		invokerBounds = (invoker != null)
 			? new Rectangle( invoker.getLocationOnScreen(), invoker.getSize() )