From e33dbbba94ce42295e9fed9f4ba7e46f9eff1517 Mon Sep 17 00:00:00 2001
From: Keith Packard <keithp@keithp.com>
Date: Thu, 29 Jul 2010 10:24:09 -0700
Subject: [PATCH] altosui: check for closed serial device before reading

Signed-off-by: Keith Packard <keithp@keithp.com>
---
 ao-tools/altosui/AltosSerial.java | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ao-tools/altosui/AltosSerial.java b/ao-tools/altosui/AltosSerial.java
index a5566ab8..96e8b61f 100644
--- a/ao-tools/altosui/AltosSerial.java
+++ b/ao-tools/altosui/AltosSerial.java
@@ -51,6 +51,8 @@ public class AltosSerial implements Runnable {
 
 		try {
 			for (;;) {
+				if (altos == null)
+					break;
 				c = libaltos.altos_getchar(altos, 0);
 				if (Thread.interrupted())
 					break;
-- 
2.30.2