From 5b3ee0a9666a9c7fe3b3c04d1fe637b7d7b935da Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Sun, 8 Nov 2020 16:19:28 -0800
Subject: Handle empty serial messages

---
 src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java')

diff --git a/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java b/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java
index 80e84c156..98f74ac84 100644
--- a/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java
+++ b/src/main/java/org/traccar/protocol/Gt06ProtocolDecoder.java
@@ -1229,7 +1229,10 @@ public class Gt06ProtocolDecoder extends BaseProtocolDecoder {
 
             buf.readUnsignedByte(); // external device type code
             int length = buf.readableBytes() - 9; // line break + checksum + index + checksum + footer
-            if (length < 8) {
+
+            if (length <= 0) {
+                return null;
+            } else if (length < 8) {
                 position.set(
                         Position.PREFIX_TEMP + 1,
                         Double.parseDouble(buf.readCharSequence(length - 1, StandardCharsets.US_ASCII).toString()));
-- 
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