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-rw-r--r--ao-tools/altosui/AltosSerial.java2
1 files changed, 2 insertions, 0 deletions
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;