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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 e84f5b63..b016c1d6 100644
--- a/ao-tools/altosui/AltosSerial.java
+++ b/ao-tools/altosui/AltosSerial.java
@@ -134,6 +134,8 @@ public class AltosSerial implements Runnable {
public void open(altos_device device) throws FileNotFoundException {
close();
altos = libaltos.altos_open(device);
+ if (altos == null)
+ throw new FileNotFoundException(device.getPath());
input_thread = new Thread(this);
input_thread.start();
}